430 MONTHLY WEATHER REVIEW DECEMBER1936 ON THE COMPUTATION OF ATMOSPHERIC TURBIDITY AND WATER VAPOR FROM SOLAR RADIATION MEASUREMENTS-A CORRECTION TO PREVIOUS NOTE In a paper in the REVIEWfor November 1936, page 377, this case, however, after November 15, Iff-Ir had been appears the following statement: measured by a very accurate instrument. It is, therefore, I was greatly shocked when I discovered that the mean of values the derived from Iu- Ir ’nay be accepted derived from Iv-Ir and from In,-I,, had been employed in deter- 8s reasonably Correct. mining the values of 0 for dry air. I very much regret this error Beghlning with January 1937, curves published by for which I assume full responsibility. Hoelper in the Deutschen Aideorologischen Jahrbuch for However, at a. conference with my former associates at 1933, and which Peussner recommcnJs, will be employed the Weather Bureau, it has now been made clear that the in the United States in computing both 0 and w by the supposed erroneous niebhod was correct’. Therefore, no method now followed at European observatories, escept corrections are necessary to earlier computed values of 8. that for the present, at least, we shnll compute w from the In computing values of P from Iff--Ir,I macle use of a difference beheen I, (dry) and I, (observed).-H. H. method that Hoelper has criticised on the ground that Kimball. I,- Ir is too small a number to give accurate results. In BIBLIOGRAPHY [RICEMOND T. ZOCH, in Charge of Library] By AMY D. PUTNAM

RECENT ADDITIONS Takegami, Toshichiro. A study of the effect of a local wind upon the sea-surface and on The following have been selected from among the titles the development of Ilie internal boundary wave. Kyoto. of books recently received as representing those most 1936. p. 10Ck-130. formulas, diagrs. 26 cm. (Reprint: likely to be useful to Weather Bureau officials in their Memoirs of the College of science. Kyoto imperial uni- versity. Series -4. v. SIX,no. 3. May 1936.) meteorological work and studies: Thomas, Harold Allen. Heck, Nicholas Hunter. The hydraulics of flood movements in rivers, by Harold A. Earthquakes. Princeton 9c London: 1936. xi, 222 p. illus., Thomas . . . assisted by workers furnished by the Civil diagrs. 23% cm. “References on general seismology”: p. 215. works administration. Pittsburgh, Pa. 1934. 70. p Knoche, Walter. diagra. 22l6 cm. Las “temperaturas sentidas” en la Penfnsula IbCrica. Madrid. U. S. Bureac of agricultural economics. 1936. 12 p. 24 cni. (Publicaciones de la Sociedad Atlas of American agriciilture, advance sheets. no. 1-8. geoprhfica nacional. Serie B. Nlimero 75.) Washington, Government printing office, 1917-1935. 8 v. Pettis, C. R. illus., maps (part col.), diagra. 46 cm. Prepared under the Stable chsnnels in erodible material. Discussion. n. p. supervision of 0. E. Baker. 1936. p. 555-561. tahlcs. 23 cni. (Amer. socy. of civil U. S. Dept. of Agriculture. Office of information. Press service. engineers. Discussion. Reprinted from April 1936 Pro- Seven windbreak trees prove hardy in testr on northern Cheat ceedings.) Plains. (Release for publicatibn Sept. 8, 1936.) Wash., Sapsford, H. B. D. C. 1936. 4 p. diagr. 27 cm. Maxima of potential gradient at Apia. Baltimore. 1936. Wentworth, C. K., &z Ray, L. L. p. 29-36. tables, diagrs. 25 ciu. (From: Terrestrial mag- Studies of certain Alaskan glaciers in 1931. N. Y. 1936. netism and atmospheric electricity, March 1936.) p. 579-933. illus., pls. 26 cni. (Bull. Geological society Scott, Harold W. of America. v. 47, Jiine 30, 1936.) The Montana earthquhles of 1935. Butte, hTontsna. 1936. [Western union telegraph company.] (At head of title: State rJf Montana. Bureau of inines and Western Unian, assistant to the weather man. New York. geology.) 1936. 1 sheet. illus. 25 cm. (Dots aud dashes. N. Y. Seljaninoff, G., & Leontjewsky, N. v. 12, no. 5. Aug. 1936.) Die Kliniaverhaltnisse der landwirtschaftliclien Kulturen auf Woolard, Edgar W. $?r Versuclisstation Kaniennaja Steppe. Leningrad. 1930. Simon Newcomb, 1536-1909. Wash., D. C. 1936. p. 139-150. 47 p. tables, diagrs. 35 cm. (Landwirtschaftliche Ver- pqrt. 25 cm. (Reprint: Journal of the Wash. acad. of suchsstation Kamennaja Steppe.) [Test in Russian; title sciences. v. 26, no. 4, April 15, 1936.) also in German.] SOLAR OBSERVATIONS SOLAR RADIATION MEASUREMENTS DURING show that all stations had an excess with the exception of DECEMBER 1936 Twin Falls, Mianli, Riverside, and Blue Hill. Beginning with t’liis issue table 3 appeal.; in a slightly By IRVINQF. HAND,Assistant in Solar Radiation Investigations different form containing two new columns, thus enabling For a description of inst,ruments employed and their the reader to better follow the method of computation. exposures, the reader is referred to the January 1935 On the computation of p and 70, see the November RE- REVIEW,pnge 24. VIEW, P. 377, and this REVIEW,P. 430. Table 1 shows that solar radiation intensities averaged Polarization observations obtamed at Washington on 6 below normal at Washington nnd Madison, and slightly clays give a mean of 55 percent with a maximum of 60 above normal at Lincoln. percent on the 5t’h. At hladison observations were ob- Table 2 shows a deficiency in the amount of total solar tained on 2 days only, the 4th and 31st, with values of and sky radiation received on a horizontal surface at all 54 and 64 percent, respectively. All of these values are stations with the exception of Madison, Fresno, New York, slightly below the corresponding normals for December. and Twin Falls. The percentage departures for the year

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