• JOHNS HOPKINS UNIVERSITY CI RCULARS PublisAed witk tAe approbation oftAe Board of Trustees VOL. YIJ.—No. 62.] BALTIMORE, JANUARY, 1888. [PRIcE, 10 CENTS. LECTURES AT 5 P. M. I. THE LOCAL STUDY OF NATURAL HISTORY, AS ILLUS.. III. ELECTRICITY. TRATED IN THE REGION ABOUT BALTIMORE. In the Lecture Hall of the Physical Laboratory. In Hopkins Hall. Monday, Wednesday, and Friday, February 6, 8, 10. — History of Elec The course of lectures below named has been arranged for the purpose tricity (two lectures) and Electrostatics b of interesting the students of the University in the observation and study of Physics. , y Dr. H. A. ROWLAND, Professor of the natural characteristics of a limited region. Some of the subjects Monday, Wednesday, and Friday, February 13, 15, 17.—Dynamic Elec. are strictly local; others are more comprehensive. Taken together, these tricity and Magnetism, by Dr. A. L. KIMBALL, Associate in Physics. lectures will exhibit the natural features of the country which pours its Monday, Tuesday, and Friday, February 20, 21, 24.—Applications of Elec. waters into the Chesapeake Bay and at the same time direct the student to tricity, by Dr. L. DUNcAN, Associate in Electricity. the relation between such phenomenaand the broader problems of physical geography and natural history. It is doubtful whether therewill be any IV. ADMINISTRATION. space in the lecture room for persons not members of the University, unless in some very exceptional instances, and several of the lecturers have In Hopkins HalL expressed their unwillingness to speak in a larger hall. WOODROW WILSON, Ph. D.,Associate Professor of Historyin Bryn Mawr 1. Wednesday, January 4.—Introductory Lecture on the Local Study of College, will give three or four lectures on Administration, beginning Fri Physical Geography and Natural History, by President D. C. GILMAN. day, March 2, and continuing on successive Fridays. 2. Thursday, January 5.—On thePhysical Features of the AtlanticCoast, by Major J. W. POWELL, Director of the U. S. Geological Survey. 3. Friday, January 6.—On the Geology of the Region about Baltimore, V. COMPARATIVE SOCIAL STATISTICS. by Dr. G. H. WILLIAMS, Associate Professor of Inorganic Geology. 4. Monday, January 9.—On the Geology of EasternMaryland, by Dr. W. In Hopkins Hall. B. CLARK, instructor in Palaeontology. ELGIN R. L. GOULD, Ph. D., of the U. S. Bureau of Labor, will give three 5. Tuesday, January 10.—On the Relationship of Geology to Natural or four lectures on Social Statistics, beginning on Tuesday, March 6, and Scenery, by Mr. ARNOLD HAGUE, of the U. S. Geological Survey, continuing on successive Tuesdays. 6. Wednesday, January 11.—On the Land Fauna, by Dr. H. NEWELL MARTIN, Professor of Biology. 7. Thursday, January 12.—On the Invertebrate Marine Fauna, by Dr. VI. OREEK LYRIC POETRY. W. K. BRooKs, Associate Professor of Morphology and Director of the In Hopkins Hall. Chesapeake Zo6logical Laboratory. Dr. HERBERT WEIR SMYTH, Reader in Greek Literature, will give four lectureson Greek Lyric Poetry, on March 12, 15, 19, and 22. II. THE FRENCH REVOLUTION. In the Lower Hall of the Peabody Institute. VII. ATHENS. Hon. ANDREW D. WHITE, LL. D., former President of Cornell Univer- In Hopkins Hall. sity and U. S. Minister at Berlin, will give a course of lectures, ten or more in number, on the Causes of The French Revolution, beginning Monday, Mr. J. R. WHEELER, formerly of the American School at Athens, will January 16, and continuing daily, except Wednesdays and Saturdays. give eightlectures on Athens, April 23, 25, 27, and 30, May 2, 4, 7, and 9. PEABODY INSTITUTE. Lectures will be given in Peabody Hall, every Tuesday and Thursday evening at 8 o’clock, during the months of January and February, as follows: Prof. T. C. Mendenhall, of Terre Haute, Indiana, two illustrated lectures, and the Literary Women of the Eighteenth Century; 3. Harriet Martinean and herCon. Jan. 10, 12, on— temporaries: 4. George Eliot and the Literary Women of To-day. 1. Earthejsakes; 2. The Charleston Earthquake of 1556. Mr. George M. Towle, of Boston, four lectures, Feb. 14, 16, 21, 23, on Mr. Edwin D. Mend, of Boston, four lectures, Jan. 17, 19, 24, 26, on The The Governments of Europe. Pilgrim Fathers. 1. Russia; 2. Germany; 3. Austria; 4. France. 1. Puritanism; 2. NewEngland in England; 3. New England in Holland; 4. Plymouth. Prof. G. Stanley Hall, of Johns Hopkins University, two illustrated lec- Rev. GeorgeWillis Cooke, of West Dedham, Mass., four lectures, Jan. 31, tures, Feb. 28, March 1, on Recent Studies in Psychology. Feb. 2, 7, 9, on Women in Literature, from Elizabeth to Victoria. 1. Scientific Studies of Trance and Spiritualistic Phenomena, including Mesmerism; 1. The LiteraryWomen ofthe Seventeenth Century; 2. Lady Mary Wortley Montagu 2. Time consumed in Acts of Thought, and the Sense of Rhythmin thought and motion. 22 JOfINS IIOPIUNS [No. 62. NOTES AND COMMUNICATIONS. A Petrographical Microscope of American Manu- shown by an index upon the silvered circle. It may also be raised or facture. By GEORGE H. WILLIAMS. depressed at will by a rack and pinion movement. A compound lens may be screwed over this Nicol when converged polarized light is desired. The The intcrest in petrography which is now manifest in America and the frame holding the prism is attached to the lower side of the stage by a constantly increasing number of students of this subject, makes the need of revolving arm, so that the entire polarizing apparatus may be swung to one a petrographical microscope of home manufacture very apparent. This side. want has been so urgently and repeatedly forced upon the writer’s atten- The stage is circular, provided with a silvered circle graduated todegrees tion that an attempt has been made to meet it. At his request, the Bausch and carries Bausch & Lomb’s admirable mechanical stage which is fitted & Lomb Optical Company, of Rochester, N. Y., has constructed a micro- for complete concentric revolution. The mechanical stage has two rectan- scope especially designed for rock-study, a.nd the result is so satisfactory as gular movements by micrometer screws, and each of these is provided with regards both workmanship, completeness in appointments and price, as to a graduated scale so that any particular point in a thin-section may be warrant a brief description. located without difficulty. The accompanying figure will give an idea of its general appearance. It The nose-piece is furnished with two screws for centering the objective; combines all the features essential for petrographical work together with it also has an adapter, into which may be inserted any of the four following certain advantages to be secured only upon the most expensive European accessories, each of which is mounted in a brass frame: (1) Quarter-undu- stands. lation-mica-plate, (2) Quartz-wedge, (3) Bertrand lens for magnifying the interference figures, (4) Klein quartz-plate or gypsum plate with red of the first order, for stauroscopic measurements. The upper Nicol-prism or analyzer is inserted in the tube below the eye- piece to avoid the decrease in the size of the field which takes place when the analyzer is put over the eye-piece as a cap. That no opening may be left where the insertion is made, the iNicol-prism is enclosed in one side of a double-chambered box. The other side of this is empty, so that crossed Nicols or ordinary light may be had at will by merely sliding the box to and fro in the tube. This box is protected above by a metal sheath and is fitted so closely into the tube as to be dust-tight. - The cost of the instrument as here described with one eye-piece and with. out objectives is $108.00; with two eye-pieces and two objectives (~ and ~ inch) its price is $135.00. On the New Books Relating to Switzerland in the Historical Library of the Johns Hopkins University. By J. M. VINCENT. Through the generosity of the Government of Switzerland, and the kind mediation of the Hon. it~mile Frey, its minister at Washington, the Uni- versity Library has come into possession of a large collection of books and pamphlets relating to the history, laws, and administration of that country. The list includes documents from all departments of the Federal govern- ment and numbers over 800 items. In the exhibition which was made of them on the tables of the Historical Library, the eye was first attracted by a great multitude of little primers in varied colors and different languages. These are manuals for the use of the army. Instructions for all branches of the military are included, manuals for the exercise of arms, the rifle, revolver, sword, sabre, the management of field pieces, cavalry practice, manuals for pioneers and the pontoon brigade, even down to handbooks for stable men, and music for the drum WGINBOrHAM and trumpet. Even to one not particularly conversant with military affairs, (cut one-third of actual ,ize.) it is an interesting study to notice the exactness with which every detail is regulated. PETROGRArHICAL MIcRoscoPE. Near these was displayed a coHection of laws on the subject of alcohol, The microscope is here represented as constructed upon what is known not only the federal statutes on the manufacture and sale of spirituous as Bausch & Lomb’s “Model Stand,” which was selected on account of its liquors, but also a comparative view of the cantonal laws, and works on the low price. It consists of a japanned iron tripod, pillars and arm which experience of other countries in dealing with this question. In view of the carry a brass stage and draw tube, the latter with coarse adjustment by rack experiment which Switzerland is now making in assuming the manufacture and pinion and fine adjustment by micrometer screw.