114 EXPERIMENT STATION. [Jan. 



of frost cracks that considerable information as to the weather 

 conditions might be obtained from observations on frost cracks. 

 Dnrinij; the hitter jiart of llarch, when the temperature was 

 hiiiher, the frost cracks did not open so wide, and it became more 

 difficult to read them accurately. The same degree of variation 

 in frost cracks may not occur in the summer months as in the 

 winter; at any rate, the change was not so noticeable. 



