316 Floristik, Geographie, Systematik etc. 



Catalina mountains in Arizona. Careful instrumental readings 

 were taken at several altitudes on the mountain side and in retur- 

 ning to the floor of the canyon an abrupt change was noticed in 

 the teraperature at a particular level, which level became higher 

 as evening advanced. The floor of the canyon was filled with a 

 stream of cooled air with a very definite surface. The author con- 

 siders that the influence of cold air drainage effects the upward 

 limitation of lowland plants and the downward occurrence of mon- 

 tane species. Harshberger. 



Spalding, O. M., Plant Associations in Vicinity of the 

 Desert Laboratory at Tucson. (Arizona, 1913.) 



This small pamphlet is Condensed from publication N*^. 113, 

 Carnegie Institution of Washington for the International Phytogeo- 

 graphic Excursion in America. Ten plates accompany the guide 

 taken from the same publication. A Statement is given of the asso- 

 ciations of river banks, the flood piain, the Bajada, the wash, the 

 hin and the constituent plants of each. Harshberger. 



Sprague, T. A. and J. Hutchinson. A Botanical Expedition 

 to the Canary Islands, 1913. (Kew Bull. Mise. Inform. W. 8. 

 p. 287—299. 2 pl. 1913.) 



The writers give a preliminary account of an expedition to the 

 Islands of Tenerife and Palma in May and June, 1913, with notes 

 on the Vegetation. Over 600 numbers of plants were collected and 

 about 50 photographs taken. The füll scientific results will be pu- 

 blished later. M. L. Green (Kew). 



Transeau, E. N., The Vegetation of Cold Spring Harbor, 

 Long Island. I. (The Plant World. XVI. p. 189-209. 8 fig. 1913.) 



Cold Spring Harbor is on the northern shore of Long 

 Island about 30 miles east of New York City. The author by 

 means of a map distinguishes four phytogeographic territories. viz., 

 oak-chestnut forest, pine barrens, prairie and salt marshes, which 

 are discussed with reference to the glacial influences Controlling 

 the past and present distribution of plants. Another sketch map 

 shows the effect of barriers on the northward extension of 298 

 coastal piain species found in southeastern Virginia. He finds that 

 Chesapeake Bay, New York Harbor are and were efificient bar- 

 riers, so that 31.5 percent of the species drop out at the Chesa- 

 peake, at New York Harbor by 27.4 percent and eastern Massa- 

 chusett by 59.7 percent. He concludes that the present distribution 

 of plants is in harmony with the geological evidence that the land 

 stood lower than at present in early post glacial times. After this 

 introductory discussion, the author describes the marine submerged 

 beach, the lower beach, the mJddle beach, the salt marshes and the 

 swamps. A diagram shows the successional relationship of the several 

 plants associations. Harshberger. 



Watson, J. R., Plant Geographv of North Central New 

 Mexico. (Botanical Gazette. LIV p. 194-217. 7 fig. Sept. 1912.) 



In North Central New Mexico, the arid climate of the 

 Southwest meets in the mountains the more humid one of the north 



