NOTES AND COMMENT '2\') 



that there is any difference between the various leaves of the same plant 

 with respect to the presence of starch or fats under the same condi- 

 tions. A sudden lowering of the temperature was found to kill plants 

 of Linnaea in which the reappearance of starch had been experimentally 

 induced. 



A valuable place in bibliographical literature is being filled by the 

 Agricultural Index (published by the H. W. Wilson Company, 958 

 University Avenue, New York). The Index is now in its fourth vol- 

 ume and is devoted to the publication of all titles in 77 of the leading 

 journals in agriculture and related subjects. The titles are arranged 

 topically and geographically, and are without abstracts. Both tech- 

 nical and popular material is included. 



A Flora of the District of Columbia and Vicinity has been published 

 as a Contribution from the National Herbarium by A. S. Hitchcock and 

 Paul C. Standley, with the collaboration of a number of Washington 

 botanists. In order to make the flora of more general use the technical 

 key to families has been supplemented by a separate key based chiefly 

 on vegetative characters. Some of the attractive scenery and showy 

 plants of the Washington region are illustrated. 



