314 



SCIENCE 



[N. S. Vol. XLIX No. 1265 



wrightii, Cyanoceplialiis cyanocephalus, and 

 Eylocichla fuscescens salicicola. 



The Canadian Zone, which covers the middle 

 mountain slopes and the highest foothill 

 ranges, occurring at altitudes of from 7,500 to 

 10,500 feet, is the boreal forest belt of spruce, 

 fir, lodgepole pine, and aspen; and is further- 

 more delimited by such mammals as Alces 

 americanus shirasi, Glaucomys sahrinus tangsi, 

 Phenacomys orophilus, Evotomys gapperi galei, 

 and Lepus americanus americanus; with such 

 birds as Oharitonetta albeola, Nuttallornis 

 iorealiSj, Melospiza lincolnii lincolnii, and Sitta 

 canadensis. 



The Hudsonian Zone, which is a narrow 

 belt covering the timberline region, and 

 ranging from altitudes of 9,000 to 11,200 feet, 

 is marked chiefly by the white-barked pine, 

 dwarfed spruce and fir; together with such 

 mammals as Ovis canadensis canadensis, Eu- 

 tamias oreocetes, and Ochotona uinia; and such 

 birds as Nucifraga columhiana and Pinicola 

 enucleator montana. 



The Arctic-Alpine Zone, which occupies the 

 mountain crests and the portion of the peaks 

 above timberline, in places from 9,500 to 13,- 

 785 feet altitude (the summit of the highest 

 mountain in the State), is a treeless area, the 

 vegetation of which is limited to low bushes 

 like Salix nivalis, and other humble plants 

 like Dryas octopetala and Poa arctica, and is 

 the home of such breeding birds as Lagopus 

 leucurus altipetens, Leucosticte australis, 

 Leucosticte atrata and Anthus spindletta 

 rub esc ens. 



The term " Upper Sonoran " as used here is 

 really not a zone in the strict sense, and would 

 be better called "Upper Austral," of which 

 zone it is the western arid division. Although 

 no mention is made of the fact, the so-called 

 " Arctic- Alpine Zone " is really a part of the 

 Arctic Eegion, which, in E'orth America, 

 covers the timdra area of the northern part 

 of the continent and the momitain tops above 

 timberline in the more southern parts of 

 Canada and in the United States; and the 

 four other zones of Wyoming belong to the 

 ISTearctic Eegion. 



Following the main part of this bulletin 



is a well-annotated list of the conspicuous 

 trees and shrubs of Wyoming that are of im- 

 portance in the' delimitation of life zones. 

 The numerous half-tones illustrate the differ- 

 ent types of physiography and the ecological 

 relations of the vegetation. Of particular in- 

 terest are the pictures of Picea engelmanni 

 and Pipus alhicaulis at timberline, which show 

 the dwarfixig and distorting effects of the severe 

 climatic conditions tmder which they here 

 live. 



The author's careful and detailed treatment 

 of this extremely interesting and intricate 

 subject leaves little to be desired; and it is a 

 matter of great regret that he could not have 

 lived to carry his investigations into other 

 parts of the United States. 



Harry C. Oberholsee 



SPECIAL ARTICLES 



A CHART OF ORGANIC CHEMISTRY, ALIPHATIC 

 SERIES 



In connection with the elementary organic 

 chemistry course given at the imiversity I 

 deemed it advisable to have charts made to be 

 placed in the lecture and laboratory rooms, 

 where students may consult them at all times. 

 In order to emphasize certain endings, type 

 groups, etc., red lettering was used. 



The chart, which is 92" x 55", is reproduced 

 on the preceding page. 



An analogous chart of the aromatic series 

 is in course of preparation. 



Alexander Lowy 



School op Chemistry, 

 Univebsitt op Pittsbtjegh 



SCIENCE 



A Weekly Journal devoted to the Advancement of 

 Science, publishing the official notices and pro- 

 ceedings of the American Association for 

 the Advancement of Science 



Published every Frida;- by 



THE SCIENCE PRESS 



LANCASTER, PA. GARRISON, N. Y. 



NEW YORK, N. Y. 



Eateied in the post-sffice at Lancmster, Pa., at lecond dajt mittef 



