290 
in France rye requires less heat to bring it to the harvest and winter 
wheat more; but, on the other hand, from the flowering to the harvest 
rye requires more and winter wheat less. 
The following table gives a résumé of Angot’s general average 
dates and temperatures for sea level for the whole of France for the 
years 1880-1887: 
> 
| Mean daily tempera- 
ture when— 
Plant. 
| Leafing Flowering 
occurs. oceurs. 
DEE rCGh, 
NAG BaF locas te = Sete ee ee Ne Stee ee Oe Oe eo 9.1 11.2 
Indian chestnut): < se 552 2 ee a a SLE PO ee ee a eee 10.1 14.6 
Binehy: cles) es sean A geen re ce See ore a ee we OO 2 a ne 1O}4"| oe ae 
Oakes so 28. 8 fase ao a Be eee ae eae Aah oe te Alene ke, oe ee a ae 013 Ue Wah epee eS 
Wider 1.56) 28s see rte desc Seton dvek See veseder et eee a the ee | ene eee yes 
Ws dem yaa 2 Bee Stee a Re tore a ie a ee a Ee ae ee | 18.9 
IRViGee 2S Raa Pte = bee a thnk ES eae ae oe, ee eet | ee 13.4 
Wranter wheab:|s2=s6-<ssaseeo see eeesd oe te gs sede He Sees aoe ee on | ee 16.2 
As to the sums of the mean daily temperatures above 5° C., count- 
ing from December 1: 
Sums of temperature 
at time of— 
Plant. 7" 
ower- 
ing. Harvest. 
COL on! 
Leta fs sae wa, Sed RS oP as Es ee fo Ate ee UN ae 8 ag a al 477 1, 085 
Wranterkwiheats i. 8 22 See Be a ee eg a le hs ee ee 707 1,256 
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. 
