14 



EXPEEIMENT STATIOK KEOOBD. 



[Tol. 88 



as those reported in previous years (E. S. R., 85, p. 508). The summary for 

 1914 is as follows: 



1 Exclusive of March and AprU. 



Forest climate of Switzerland {Rev. Sd. [Paris], 55 (1917), No. 16, pp. 498, 

 499). — The variations of temperature and precipitation at different altitudes 

 and varying conditions of exposure and forest cover are discussed. 



Observations at the Stavropol meteorological station, I. G. Chebkashenko 

 (Stavropol-Kavkaz. Selsk. Klwz. Opytn. Sta., Mat. 1905-1912, Nahlvud. Met. 

 Sta. Zapad. Opytn. Polut, No. 1 (191S), pp. 6). — Tables are given showing the 

 temperature of the air and the precipitation for eight years (1905-1912), aa 

 well as the temperature and precipitation for the years of highest and lowest 

 crops of winter wheat during that period. 



Dates of the last spring and first autumn frosts and the average times of sow- 

 ing and harvesting the principal crops of the region are also given. The 

 average date of the last spring frost, 1904r-1912, was April 19; of the first 

 autumn frost, October 8. The average seedtime and harvest dates, 1901-1912, 

 were as follows: Beginning of seeding of winter wheat, September 16, begin- 

 ning of harvest, July 14; spring cereals, March 26, July 12; potatoes April 8, 

 September 10; corn, April 18, September 21. 



The amount and distribution of temperature and precipitation for the years 

 giving the highest and lowest yields of winter wheat are shown in the following 

 table : 



Temperature and precipitation for the highest and lowest yields of lointer 



wheat, 1905-1912. 



Month and year. 



August 



September , 



October 



November . 

 December.. 



January 



February . . 



March 



April 



May 



June 



July 



Whole year 



Average temperature. 



Highest yield. 



1909-10. 1911-12. 



Degrees F. 

 20.0 

 18.7 

 10.0 

 6.7 

 .3 



- 2.2 



- 2.4 

 1.1 

 8.3 



13.4 

 17.9 

 21.3 



Degrees F. 

 18.9 

 12.5 

 7.2 

 4.1 



- 3.4 



- 3.2 



- 2.6 

 2.8 

 5.3 



11.0 

 17.7 

 17.5 



7.3 



Lowest 

 yield, 



1907-8. 



Precipitation. 



Highest yield. 



Degrees F. 

 18.8 

 11.9 

 8.4 



- 1.8 



- 2.2 



- 5.7 



- 2.8 



- 1.7 

 6.0 



12.7 

 18.5 

 19.8 



6.8 



Inches. 

 20.4 

 C3.4 

 .8 

 57.0 

 21.2 

 22.1 

 16.6 

 14.0 

 58.4 

 94. S 

 85.4 

 74.0 



528.1 



1911-12. 



Inches. 

 39.1 

 66.8 

 40.1 

 16.6 

 11.5 

 12.4 

 32.9 

 11.9 

 59.0 

 81.7 

 104.1 

 137.3 



C13.4 



Lowest 

 yield, 

 1907-3. 



Indies. 

 6.1 

 53.6 

 5.2 

 31.9 

 34.9 

 23.0 

 23.3 

 21.3 

 36.0 

 68.0 

 69.2 

 74.9 



447.9 



