2(>1 



or verv bad ; 2, small or bad ; ;J, passable or niodiocre ; 4, fairly trood ; 

 5. good ; 0, ver}' good. 



Dates when mean 

 temperature of 

 air thermome- 

 ter in shade— 



During the season. 



General character of 

 sugar crop in Pas 

 de Calais. 



The climatic data given in the above table as directly applicable to 

 the seasons of growth of the beet root illustrate what should be given 

 for any similar study of development of any crop. But it is com- 

 monly the case that the dates of the various phenological epochs are 

 not exactly given, and that we have to rely upon general tables of 

 general climatic conditions month by month, such as are recom- 

 mended by the International Meteorological Congress of Vienna and 

 by that of Rome. Therefore, for the sake of comparison with other 

 climates whose data are given on the so-called international forms, I 

 give in the following table a part of PagnouFs tables of average tem- 

 perature Centigrade and rainfall in millimeters as observed at Arras : 



Mean daily shade temperature. 



1874 

 1875 

 1876 

 1877 

 1878 



Apr. i May. June. July. Aug. Sept. Oct. 



8.6 

 11.0 

 9.6 

 9.3 



19.1 

 20.1 

 17.4 

 19.6 

 17.8 

 18.0 

 15.5 



17.0 

 19.1 

 19. 15 

 17.7 

 18.6 

 17.6 



Total monthly rainfall. 



Apr. May. June. July. Aug. Sept. Oct. 



48.6 

 20.7 

 8.0 

 41.3 

 45.0 



45.5 ^.3 

 32.9 I 25.7 

 m.7 [ H2.0 

 1.5.3 32.0 

 88.2 23.0 

 88.4 60.6 

 51.7 138.6 



26.2 

 16.0 

 6:17 



61.3 

 46.7 



40.3 I 33.5 

 34.2 1 93.3 



87.3 87.0 

 96.5 50.3 



42.9 



;«.5 



56.1 

 47.2 

 61.6 

 24.5 

 48.5 

 87.3 

 4.5.4 



The preceding stud}' gives n first idea as to the relation between 

 climate and the development of the leaves, the roots, and the sugar, 

 and offers a first step toward determining how suitable for the beet- 

 sugar industry any climate may be, and especially does it suggest to 



