12 
University of California Publications in Zoology [Vol. 27 
Dec. Jan. Feb. Mar. Apr. May June July Aug. Sept. Oct. Nov. Dec. 
Fig. A. Mean monthly air temperatures (in degrees Fahrenheit) at Napa, 
California ( ) ; at Waco, Texas ( ) ; and at Ithaca, New York ( ). 
Data from Henry, 1906, pp. 988, 429, 195. 
70 ° 
60 ° 
50 ° 
40 ° 
30 ° 
20 ° 
Dec. Jan. Feb. Mar. Apr. May June July Aug. Sept. Oct. Nov. Dec. 
Fig. B. Mean minimum air temperatures (in degrees Fahrenheit), by months, 
at Napa, Waco, and Ithaca. See figure A for legend. 
