386 BOTANICAL GAZETTE [MAY 
Near the Mowry Mine in the Patagonia Mountains there occurs a 
stand of Chihuahua pine which represents an excellent distribution of 
all sizes of trees up to 30 cm. in diameter and 9-15 meters tall. Many 
trees from 7.5 cm. up have been cut for mine timbers, and there is some 
1 2 
Fics. 1, 2.—Fig. 1, Sprouts on Chihauhua pine as a result of injury by cattle; 
collected in Boss Canyon: fig. 2, Sprouts on Chihuahua pine as a result of forest 
fires; collected in Flux Canyon. 
grazing injury. Not a single case was found where the stumps of trees 
smaller than 7.5 cm. in diameter had failed to produce thrifty sprouts, 
and fully 30-50 per cent of the stumps of trees up to 22.5 cm. in diameter 
had produced very thrifty sprouts, most of the fail stumps occurring 
