175 



)i' tlic varioties of wheat ordinarily 



uoedod for ripening tlie crops of tlie ^. ... 



cultivated in Xormandy, as shown in the following table: 



By similar calculations Herve Mangon obtains for other crops as 

 cultivated in Normandy the following results : • 



Herve Mangon concludes his essay with two important practical 

 rules, deduced from his data relative to the climate and crops of the 

 department of La Manche: (1) In a mild and uniform climate, like 

 that of the northwest of France, there is always an advantage in 

 sowing the seed early in the autumn; (2) by computing annually the 

 sums of the degrees of temperature observed since the date of sowing 

 and by consulting the numerical tables given in this memoir one can, 

 with great accuracy, calculate four or six weeks in advance the date 

 of the ap])roacIiing harvests of the resj)ective plants. 



The tables given by jSlangoii for his locality can be reproduced for 

 American stations wherever the meteorological observations and the 

 dates of planting and harvesting are recorded: although it may be 

 possible to consider more minute details of climate and soil than he 

 has done, yet the success attained by him in his elementary collation 

 of fundamental data niu.st stimulate to siiiiiiai- work in this country. 



