ABSTRACTS 



Authors of scientific papers are requested to see that abstracts, preferably 

 prepared and signed by themselves, are forwarded promptly to the editors. 

 Each of the scientific bureaus in Washington has a representative authorized 

 to forward such material to this journal and abstracts of official publications 

 should be transmitted through the representative of the bureau in which they 

 originate. The abstracts should conform in length and general style to those 

 appearing in this issue. 



METEOROLOGY. — Free air data at Mount Weather for October, Novem- 

 ' her, and December, 1910. Bulletin of the Mount Weather Observa- 

 tory, 3: 304-346. 1911. 

 During this period of 92 days, 85 kite and 7 captive balloon ascensions 

 were made at Mount Weather, Virginia. The average height attained 

 was 3115 meters above sea-level. The temperature, relative humidity, 

 direction and velocity of the wind were all obtained at numerous levels 

 and are given both in tabular form for each flight and graphically for 

 each half month. W. J. Humphreys. 



METEOROLOGY. — Temperature departures, monthly and annual, in 

 the United States, January, 1878, to June, 1909, inclusive. Bulletin 

 U. S. Weather Bureau. 1911. 



The 474 separate charts of this bulletin show the departure from the 

 normal of the mean monthly and mean annual temperatures of the 

 United States for the period, January 1873, to June 1909, inclusive, one 

 for each month and one for each year. 



Beginning with the issue for July, 1909, similar charts have appeared 

 in each number of the Monthly Weather Review, so that the series is 

 now complete from January, 1873, to date. W. J. Humphreys. 



METEOROLOGY.— Frost data of the United States; and length of the 

 crop-growing season. P. C. Day. Bulletin U. S. Weather Bureau 

 No. 5. 1911. 



This bulletin consists essentially of five large charts that show, graph- 

 ically, certain climatological data of vital importance, namely: (1) 

 The average date of the last killing frost in spring. (2) The average 

 date of the first killing frost in autumn. (3) The latest date on which 



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