40 SOME INSECTS INJURIOUS TO FORESTS. 



the borer and are otherwise vigorous and healthy. From a well-estab- 

 lished principle in the heredity of plants and animals, this practice of 

 propagating from the best examples must certainly yield better results 

 than would follow a disregard of the character of the trees from which 

 seed or root propagations are made. 



For reference to literature, and other information not included in 

 this paper, the reader is referred to Part I of this bulletin, pages 

 1 to 16. 



