124 PRINCIPLES OF GARDENING. [CH. II. 



tion that that part is colder, and ^^•ill be usually more 

 unproductive and certainly later in its vegetation. 

 I once saw a remarkable proof of this. On one 

 portion of a field the evening mist-cloud was always 

 obsen-ed to settle sooner than on the other parts. 

 This portion also always bore the lightest part of the 

 crops grown. It was under-drained, and the early 

 mists and unproductiveness simultaneously ceased. 



i 



