24 NOTES AND COMMENT 



History, biography and bibliography, J. H. Barnhart; Horticulture, 

 W. H. Chandler; Morphology, E. W. Sinnott; Paleobotany, E. W. 

 Berry; Pathology, Donald Reddick; Pharmacognosy, Henry Kraemer; 

 Physiology, B. M. Duggar; Taxonomy, Wilham Trelease, J. M. Green- 

 man, J. G. Schramm. 



The results of work on the natural reproduction of Douglas fir and 

 western white pine have recently been published in the Journal of 

 Agricultural Research by Mr. J. V. Hofmann, Investigations carried 

 out in Washington, Oregon and Idaho indicate that the reappearance 

 of these trees after a burn is chiefly due to the germination of seeds 

 buried in the deep litter of the forest floor. Seed trees are unable to 

 restock the forest for a distance of more than 300 feet. A second burn, 

 destroying trees too young to have shed seed, results in a severe check 

 to forest reproduction. The findings presented in this paper are of 

 considerable importance in the theoretical discussion of succession as 

 well as in their bearing on forest management in the northwest. 



A Flora of the Rocky Mountains and Adjacent Plains has just ap- 

 peared from the hand of Dr. Per Axel Rydberg, of the New York 

 Botanical Garden. The work covers Colorado, Utah, Wyoming, 

 Idaho, Montana, Saskatchewan, Alberta, and parts of Nebraska, 

 South Dakota, North Dakota and British Columbia. It contains 

 1110 pages and is privately published by the author (price $3.75). 



Mr. V. C. Finch and Dr. 0. E. Baker have prepared a pubhcation 

 entitled Geography of the World's Agricidture, which will appear at 

 an early date as a Contribution from the Office of Farm Management 

 of the Department of Agriculture. It will be a book of 150 pages, 

 abundantly illustrated with maps showing the quantitative distribu- 

 tion of the leading agricultural products of the world. 



