DISEASES OP CONIFERS. 57 



brown color ; and so will excessive heat destroy their vi- 

 tality. A too rapid growth of a particular branch will 

 very frequently deprive the one adjoining of its due share 

 of nourishment, and death ensues. Again, certain winds 

 have a disastrous effect on the young shoots ; or the early 

 frosts of spring deprive them of life. 



