I04 Forestry Qiuirterly. 



the nuts, protection and care for two years, comes to around $20, 

 and where soil preparation is necessary up to $35 (with us it 

 might go to double that figure), using 2,900 nuts (allowing 40% 

 loss). 



Under the pure stands naturally there is considerable weed- 

 growth coming up, and cultivation is necessary ; the result is then 

 astonishing on the growth, effecting a difference in heightgrowth 

 of over 40 inches in 5 years. 



The experience is recorded that the species does not stand prun- 

 ing very well and that wounds heal over very slowly, even i to 

 1.5 inch wounds do not callous over in 10 years. Hence pruning 

 is undesirable, and, since late frosts are apt to kill leaders, in order 

 to correct the form the author pinches off frozen leaders the 

 shoots formed afterwards, leaving only one stout one for leader- 

 ship. Such wounds of the young shoot callous readily the same 

 season. 



Silvicultural treatment similar to the oak, is suggested ; only all 

 operations of thinning should come a little earlier, and under- 

 planting as soil cover, since under these intolerant species weed- 

 growth cannot be kept down otherwise, is indicated, and for such 

 a valuable species pays. 



Of these three nut trees nigra is the most rapid, cinerea the 

 slowest grower. The latter grows very evenly, but the former 

 quite erratically, some yearlings may be 30 to 45 inches in height, 

 others again not over half that height and down to 7 inches in dry 

 or wet cold summers, and occasionally a second growth takes 

 place in August to September. 



The average and maximum heights for the two American 

 species were as follows in inches: 



Year. i 2 5 7 10 15 18 



For the first 18 years then nigra has grown at the rate of 2 to 

 2.5 feet per annum. Some 70 to 80 year old trees in the neigh- 

 borhood grown in close stand show that this rate can be main- 

 tained for a long time, several specimens of 124 feet being 



