14S ROCHESTER ACADEMY OF SCIENCE. [May 23, 



perpetuation of vertical motion and continuance of centers of low 

 barometer become possible in spite of the tendency of gravitation to 

 cause their cessation by filling up. So too the general eastward push 

 of anti-cyclones and the change of type of weather in different years, 

 and even the diurnal ebb and flow of barometric pressure best seen in 

 the tropics, all occur in such relations and with such concomitants 

 and regular order of sequence as are consistent with the idea that they 

 are due to inductive forces, originated and propagated in the manner 

 that has been indicated and bearing but little if any relation to vari- 

 ability of the sun's power of heat emission. 



These views have resulted not from theoretical considerations, 

 but from attempts to classify the phenomena in question in conformity 

 with their most obvious relations. Not only the categories of time 

 and place but also the intimate nature of the phenomena themselves 

 have been considered. In other words it is not a question of mere coin- 

 cidence, an adequate underlying principle, namely that of induction, 

 being everywhere apparent. In tracing out the ramifications of this 

 principle it is possible that there may have been mistakes of detail. 

 Nor is it claimed that the research is anywhere near complete even in 

 respect to essential features. The purpose of the present discussion 

 will have been accomplished if it shall have been made logically 

 impossible for any one to pretend to have made an adequate study of 

 the thunderstorm or aurora without having taken into the account the 

 relations here pointed out. 



The paper was discussed by Mr. J. E. Putnam. 



May 23, 1892. 



stated meeting. 



The President, Professor H. L. Fairchild, in the chair. 



A large audience present. 



Professor Charles Wright Dodge, gave the fifth lecture of 

 the Popular Lecture Course, on 



THE YEAST PLANT ; ITS STRUCTURE AND 

 PHYSIOLOGY. 



The lecture was illustrated by charts, microscopes and experi- 

 ments. 



