3^6 Proceedings of Societies. [zoe 



Botanical Gazette, XV. May. Hepaticae Africanai nova; (with 

 plates xvii-xix; by F. Stephani. Celloidin imbedding in plant his- 

 tology, by A. C. Eycleshymer. The Collodion method in botany, 



by M. B. Thomas. 



J 



trait), by F. W. Anderson. Notes on the flora of the Lake Superior 

 Region, III, by E. J. Hill. 



A Provisional Host Index of the Fungi of the United States, 



Part II, ApetalcB. By W. G. Farlow and A. B. Seymour. Th 



second of these invaluable papers comes with the promise of the 

 speedy appearance of the third. If anything could check the rabid- 

 species maker in his wild career, one would think it might be done 

 by the bracketed synonymy of some of these pages. It is to be 

 feared, however, that this class of mycologists will, instead of 

 amending their ways, use this Host-Index as a convenience in spy- 

 ing out unrecorded hosts and enrolling their guests as new species. 



H. w. H. 



PROCEEDINGS OF SOCIETIES. 



December ist, i8go. President Harkness in the chair. 



Lieutenant John P. Finley, U. S. A., read the following paper on Cyclonic 

 Development and Precipitation on the Pacific Coast: 



The weather of a place is generally the result of atmospheric conditions which 

 have their initiatory development several hundred miles distant and arc brought 

 therefrom under the influence of cyclonic circulation. In mountainous countries 

 weather conditions are strongly localized. General cyclonic movements are broken 

 up under the extraordinary variations in temperature which characterize all regions 

 where the surface circulation of the winds is continually interrupted and diverted 

 As the general movement of the atmosphere is from west to east, and all storms 

 move in conformity with this influence, we must generally look to the westward in 

 search of the conditions which give rise to our weather, wherever located north of 

 the 30th parallel. Between the equator and 26° north and 26° south iatitu'le storms 

 move toward the west under the influence of that peculiar circulation of the atmos- 

 phere called the "trade winds." These latitudes mark the apices of the parabolic 

 paths of the cyclonic movements, where the direction of progressive movement for 

 a short distance, is north in the northern hemisphere and south in the southern 

 hemisphere, and thence eastward in both hemispheres. 



_ As to Pacific Coast weather it all comes from the west, and its source of supply 

 IS the heat and moisture of the Japan current. All of the storms which enter this 

 country from the Pacific Ocean proceed from the vicinity of the Aleutian Archipel- 

 ago Tins location, and farther to the southwestward near the Japan Islands is 

 the breeding ground of the storms of the North Pacific. A proper understanding 

 of this matter requires a knowledge of the conditions of storm development It is 



