Johns Hopkins University Circulars
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JOHNS HOPKINS UNIVERSITY CI RCULARS Publis/ied witA t/ze approbation of tAe Board of Trustees VOL. XY.—No. 123.1 BALTIMORE, FEBRUARY, 1896. [PRICE, 10 CENTS. PROCEEDINGS OF THE SCIENTIFIC ASSOCIATION OF THE JOHNS HOPKINS UNIVERSITY, 1895-96. CONTENTS. SCIENTIFIC ASSOCIATION. SCIENTIFIC ASSOCIATION: PROCEEDINGS. One Hundred and Twenty-second Regular Meeting, November 17, Abstracts of Papers Read. 1895. The Discovery of Helium. By W. W. RANDALL, - 33 Professor REMSEN, President of the Association, in the Chair. On the Spectrum of Cl~veite Gas. By J. S. AMES, - 33 Solution and Diffusion of Certain Metals in Mercury. By W. J. After a few remarks by the President, the following papers HUMPHREYS, - 34 were presented and read: Theories of Color Sensation and of the Perception of Sound. By 1. The Discovery of Helium. By W. W. RANDALL. W. J. MATHER, 34 Dr. Randall discussed the history of the discovery of helium and the Recent Work on Impregnation in Flowering Plants. By J. E. sources from which the gas is derived. The methods employed for its HUMPHREY, 34 purification were considered, as were also the apparatus with the aid of The Temperature of the Earth’s Interior. By G. K. GILBERT, - 34 which the specific gravity was determined, and that by which the rate of propagation of sound-waves in the gas—and hence the ratio of the specific heats—could be ascertained. After reference to certain ofthe physical and chemical properties of helium, mention was made of the views which have SCIENTIFIC NOTES been put forward to account for its peculiar behavior and to fix its place in Effect of Pressure on the Wave-lengths ofLines in the Arc-Spectra the general system of the elements. of Certain Elements. By W. J. HUMPHREYS and J. F. MauLER, 35 2. On the Spectrum of Cl~veite Gas. By J. S. AMES. Demonstration of the Existence of a Limit for Regular Sequences The chief interest in the discovery of this new gas by Professor Ramsay of Rational Numbers. By A. S. CHESSIN, - - - - 37 lay, at first, in the fact that its spectrum gave the chromospheric line D,, On Infinite Products. By A. S. CHESSIN, 38 never before seen in the spectrum of a terrestrial gas, but which has been A New Classification of Infinite Series. By A. S. CHESSIN, - 39 attributed to a solar element called “Helium.” Further investigations On the Representation of Imaginary Plane Curves. By RENIl DE by Crookes, Lockyer, Runge, Paschen and Vogel, have extended the knowledge of the spectrum of the gas, of its nature, and of its existence SAUSSURE, 39 on the sun and bright stars. The spectra of many elements, e. g., all the German Manuscripts in the Library of Maihingen in Bavaria. By alkalies, consist of three series—one ofstrong lines and two of weaker ones, F. G. G. SCHMIDT, 40 which may be single, double or triple, but which stop at identically the An Early German Edition of iEsop’s Fables. By G. C. I~EIDEL, 42 same wave-length in the more refrangible end of the spectrum. These An Explanation of “mio trapo” in the Poema del Cid, 1. 2788. @By series all obey the same law, 1 B U C. C. MARDEN, 43 -=A±-~ A nfl LIST OF RECENT PUBLICATIONS IN HISTORY AND POLITICS, 43 where x is the wave-length; A, B, 0 are constants for any one series, and CURRENT NOTES, 44 n is in turn each one of a series of integer numbers—i, 2, 3, 4, etc. 44 For elements of different atomic weights, the constants A, B, C seem to UNIVERSITY SCHOLARSHIPS, - - - - - vary in a regular manher. Runge and Paschen have been able to prove HOPKINS SCHOLARSHIPS, 44 that there exist in the spectrum of Cl~veite gas six series—two principal ones and four subordinate ones; and they have shown that, assuming the presence in the gas of two elements of molecular weights less than 6, the 34 JOfiNS HOPKINS [No. 123. nature of the entire spectrum can be fully accounted for. The heavier of the two gases contains the D of color sensation. A study of the Young-Helmholtz and Hering theories 3 line, and so must be called “Helium,” while prove their inability to account for many facts, while the theory of Mrs. the other has received the provisional name “ Parhelium.” Christine Ladd Franklin has been substantiated by several discoveries made In Young’s observations of chromospheric lines, it is stated that some since its proposal. Though hypothetical in its concept of a peculiar molec- lines were alway~ present, others less frequently; and Runge and Paschen ular cause, its explanation of the phenomena is quit~ scientific and it is have shown that tbis division of the lines corresponds accurately to their therefore to be regarded as the more probable. With reference to hearing, separation of the spectra of Helium and Parhelium. These same spectra the most important results have been obtained in the study of the equili- occur in the light emitted by many of the fixed stars. brium functions of the ears of fishes and other animals, substantiatingthe old idea of the static function of the labyrinths and showing that the otolithic 3. Solution and Diffusion of certain Metals in Mercury. By W. structures serve as organs of orientation. J. HUMPHREYS. The investigation, of which this is a summary, was begun with the object 2. Recent Work on Impregnation in Flowering Plants. By J. of determining the extent to which these phenomena differ, if at all, in this E. HUMPHREY. case from the solution and diffusion of non-metallic solids and liquids. Until about four years ago, impregnation in flowering plants, which con- The method of investigation was to fill a vessel of constant cross section sists in the penetration of the pollen-tube to the egg-cell in the ovule, was with pure mercury, put on its surface a freshly amalgamated piece of the known to take place only by the growth of the pollen-tube across the cavity metal to be examined, and after allowing it to stand a definite length of of the ovary and through the micropyle left by the coats of the ovule. In time in a place free from external disturbances and of fairly constant tem- 1891 Treub described impregnation in Casuarina, the Australian iron-wood, perature, to remove from known depths below the surface samples of the by thedownward growth of the pollen-tube through the tissue of the ovary amalgam and analyse them. to the chalaza, or stalk of the ovule, and its upward growth through the body The metals examined were lead, tin, zinc, bismuth, copper and silver, and of the ovule to the egg-cell. In 1894 Miss Benson found the same thing to the results indicated that there is no essential difference between the solu- occur in several English catkin bearing plants, the horubeam, alder, tion and diffusion of these metals in mercury and the same phenomena in hazel, etc. any other case. INawaschin has just published the results of his detailed studies of the Probably the most interesting results were those given by copper and white birch, which agrees closely with the alder. In attempting to explain silver, both of which dissolved to a much less extent than any of the other chalazal impregnation, he points out that the entire course of the pollen- metals examined, but diffused more rapidly. At 280 C. the silver dissolved tube of the Gymnosperms is through tissue. He thinks that in these prim- to the extent of only about one part in two thousand, and the copper to a itive Angiospernts, the descendants of Gymnosperms, the tube has not yet still less extent—about three parts in a hundred. thousand; while the rate acquired the ability to grow across open spaces, and therefore takes the of diffusion of the silver was about twenty millimeters per minute, approxi- indirect route which enables it to make its whole course through tissue. mately sixty times that of copper and fully six hundred that of zinc. He also announces that the elm constitutes an intermediate form between This investigation, of which the details will soon be published, was sug- those with chalazal and those with true micropylar impregnation. gested to me by Dr. J. W. Mallet, F. IR. S., of the University of Virginia, Much work on this line is yet to be done, which may throw light on and carried out there under his supervision during the months of July, relationships among the flowering plants. August and September, 1895. The following papers of research were then presented and read One Hundred and Twenty-fourth Regular Meeting, January 23, by title: 1896. The President of the Association in the Chair. 1. Geometrical Multiplication of Series. By A. S. ~HEs5IN. (Annals of Mathematics.) The following papers were presented and read: 2. On Cauchy’s Numbers. By A. S. CHESsIN. (Annals of Mathematics.) 1. The Temperature of the Earth’s Interior. By G. K. GILBERT. 3. On Divergent Series. By A. S. CHEssIN. (Bull. Am. Math. The speaker first pointed out the difficulty attetiding any investigation Soc.) of the earth’s interior, and stated that in the present condition of physical 4. On a point of the Theory of Functions. By A. S. CHEssIN. science all estimates of interior temperature are necessarily founded on ques- (Am. Jour. of Math.) tionable postulates. He then gave the results of a series of computations of the average temperature, each starting with a different group of postulates. 5. Demonstration of the Existence of a Limit for Regular Se- quewies of Numbers.