37 



or, between the 1st and 4th periods there was a total decrease of 63.95 inches, or a yearly 

 difference of 12.79 inches. 



' The total moisture is divided as follows : — 



Total Rain Fall. 



184044 191.020 inches. 



1850-54 137.999 „ 



1860-64 131.706 ,r 



1870-74.. = ..113.150 „ 



or, between the 1st and 4th periods there was a total decrease of 77.87 inches, or a yearly 

 difference of 15.35 inches. 



Total Snow Fall (12 inches snow, 1 inch rain). 



1840-44 .• 322.70 inches. 



1850-54 : 320.10 „ 



1860-64 344.38 „ 



1870-74 473.83 „ 



or, between the 1st and 4th periods there was a total diflerence of 151.13 inches, or a 

 yearly increase of 12.59 inches. 



These calculations agree exactly with theory. In comparing the individual quarters 

 of each period, he arrived at the following results : — March has remained much the same 

 still ; with April is found a decrease of more than ^ inch, a decrease that increases with 

 each month until September. Thus : — 



April, July, August, 

 May, June. September. 



1840-44 48.55 68.101 



1850-54 40.195 48.625 



1860-64 32.742 45.617 



1870-74 34.670 35.14 



The significance of this unpleasant change must be evident to all. The average tempera- 

 ture of the two months of germination is lower now than it was forty years ago. Thus : — ■ 



March. 



1840-44 29.88 



1850-54 30.24 



1860-64 29.02 



1870-74 27.24 



This undoubted fact causes what is termed a late spring, the period for growth and 

 development of the plant being shorter than formerly. The temperature of May, the 

 first month of real growth, is now warmer than formerly, by an average of nearly two 

 degrees. The growth is thus apparently forced unnaturally to make up for loss in April, 

 but the attempt is rendered futile by an undue dryness, the rainfall in May having 

 been: — 



1840-44 15.015 inches. 



1850-54 13.675 „ 



1860-64 14.055 m 



1870-74 8.640 „ 



