' 290 



in France rye requires less heat to bring it to the harvest and winter 

 wheat more ; but, on tlie other hand, from the flowering to the harvest 

 rye requires more and winter wheat less. 



The following table gives a resume of Angofs general average 

 dates and temperatures for sea level for the whole of France for the 

 vears 1880-1887 : 



As to the sums of the mean daily temperatures above 5° C.. count- 

 ing from December 1 : 



The harvest of spring barley occurs when the sum of the mean daily temperatures, 

 less 5° C. and counting from March 21 or the average date of sowing, amounts to 1,102° C. 



The large variations of the individual numbers whose means are 

 given above are probably due to special meteorological conditions, and 

 Angot states that he will report upon these if it is possible to take 

 them into account when ten whole years of observations have accumu- 

 lated. 



REQUESTS FOR PHENOLOGICAL OBSERVATIONS. 



The influence of a climate upon cultivated crops is parallel to its 

 influence upon uncultivated plants, and the comparative study of 

 climates in their relations to plants can be attained by careful obser- 

 vations of the general features of the natural life of special plants 

 that are widely distributed over the earth. To this end several 

 special invitations have been issued urging the observation of certain 

 phenological stages. 



