THERMAL CONSTANTS FOR LOCUST-EGGS. 



COKSICANA, TEX. 



431 



, 



Number of days. 





1 



1 

 1 



1 



a 



>■ 







i 



1 



p 



CS 

 1-5 



1 









t? 



Maximum temperatures were under 



50° ... 





 

 2 

 8 

 6 

 14 





 

 2 

 14 

 14 

 1 



1 



G 



14 



5 



4 









 4 



15 



12 

 

 



4 



9 

 12 

 6 

 

 



2 

 3 

 12 

 12 

 

 



1 



8 

 10 

 9 

 3 

 







1 

 4 



8 



'5 





 

 2 

 6 

 17 

 6 













Between 00° and (jflo 







JjCtweou 70° and 79° 



2 



Between 80° and 89° 



11 



Over 89° 



17 







Tlio minimum temperatures were 



29 



20 



12 



11 



9 



10 



9 



25 



26 



30 







Monthly mean temperatures 



730.5 



63°. 9 



55°. U 



54°. 2 



52°. 2 



55°. 1 



530.9 



670.0 



71°. 8 



77°. 3 



We shall make a pretty close approximation to the number of hours 

 duriug which the eggs were exposed to a hatching temperature of 60° 

 r. if we allow for each of the maximums above 50° in the preceding 

 tables the number of hours given in the following table : 



September , 



October 



Kovcmber . 

 December. . 



1875. 



January . 

 February 

 March — 



April 



May 



JUEO 



1876. 



Fort 

 Garry. 



Brecken- 

 ridfi-e. 



Yankton. 



North 

 Platte. 



Dodge 



City. 



Corsicana. 



h. 

 24 

 20 

 16 

 12 



The total number of hours during which the eggs are exposed to a 

 hatching temperature equal to 60° F. is now found by multiplying their 

 number by the number of maximums above 50° as before given, and the 

 following results are thus obtained : 



Total nU'Viber of liours during wMcTi eggs were exposed to a hatching temjperature equivalent 



to 60°. 



Fort 



Brecken- 



Yankton. 



North 



Dodge 



Garry. 



ridge. 



Platte. 



City. 



h. 



h. 



h. 



h. 



h. 



324 



406 



480 



.540 



eoo 



48 



160 



275 



348 



540 







36 



60 



72 



264 











28 



60 



144 











20 



20 



120 











24 



64 



150 















54 



104 



66 



78 



184 



276 



324 



324 



290 



306 



464 



558 



504 



420 



480 



540 



GOO 



Corsicana. 



1875, 



Septf^mber 



October 



Novem ber 



December 



1876 



January 



February 



March " 



Apul 



May 



June 



h. 



720 



600 



464 



372 



324 

 324 

 464 

 600 

 744 

 720 



