248 



of their growth. The tables of statistics of the climate and the 

 crops, or the corresponding graphic diagrams, allow us to take exact 

 account of the features of the past years and to approximately com- 

 pare these characteristics with the agricultural features of the cur- 

 rent year. Let us compare among themselves the five crops for the 

 years from 1873 to 1877. Of these five years, 1873 gave a poor crop. 

 On the contrary, 1874 gave a very good crop, both as to quantity and 

 quality. The crop of 1875 attained an average as to quantity, but 

 the quality of the grain was below the average. Notwithstanding 

 the great irregularities of 1876 it gave us a good average as to quan- 

 tity and excellent grain as to quality. In 1877, notwithstanding a 

 great development of straw or stalks, the crop of grain was below 

 the average as to quantity and quality; therefore, as regards their 

 crops of grain, these years can be classed in the following decreasing 

 order: 1874, 1876, 1875, 1877, 1873. 



We will compare these harvests with the following meteorological 

 tables for these years, as based on observations at Montsouris : 



MONTHLY RAINFALL. 



1874-75. 1875-76. 



October... 

 November 

 December 

 January .. 

 February _ 



March 



April 



May 



June 



July 



August 



September 



mm. 

 65.2 

 36.5 

 6.0 

 23.1 

 17.5 

 11.4 

 16.1 

 36.6 

 47.8 

 54.5 

 23.1 

 65.1 



mm. 

 5L0 

 44.2 

 8L8 

 63.2 

 10.9 

 8.6 

 10.1 

 24.6 

 82.0 

 82.1 

 73.7 

 32.8 



75.4 

 22.4 

 9.1 

 57.8 

 62.7 

 24.3 

 14.3 

 70.6 

 24.6 

 72.3 

 65.3 



mm. 

 29. 

 .51. 



MONTHLY EVAPORATIONS, AS MEASURED BY THE PICHE EVAPORIMETER. 



October 



November . 



January ... 

 February . . 



March 



April 



May 



June 



July 



August 



September. 



39.3 

 33.1 

 58.9 

 58.3 



40.5 

 46.5 

 90.5 

 90.8 

 120.7 

 99. 2 

 93.8 

 63.0 



