164 TRANSACTIONS OF SCIENTIFIC SECTION. 



shown upon a screen to a large audience. On a subse- 

 quent occasion, he presented consecutively these three 

 topics: "On Some New Laboiatory Appliances," com- 

 prising some ingenious original modifications of Rich- 

 ards' aspirator for the immediate and perfect removal of 

 noxious fumes in a laboratory, and other appliances ; 

 also, "Influence of the Density of a Gas on the Electric 

 Discharge," illustrated by some remarkably fine experi- 

 ments ; and, "Notes on the Liquefaction of Gases." 



Dr. J. M. DeGarmo occupied an evening, with much 

 acceptation, on "Evidence of Intelligence in Butterflies." 

 Much of the interest and value of this paper was due to 

 the feature that many of the facts from which conclu- 

 sions were drawn were derived from his own careful and 

 extended observation. 



Mr. C. N. Arnold entertained and instructed the 

 society by a full account of "Gums and Resins," in 

 which their origin, nature, and economical value were 

 well described. 



The chairman, on three separate evenings, presented 

 the topics, "An Interesting Geological Locality at Corn- 

 wall, N. Y.," and " Report of Progress in Geological In- 

 vestigations in the Vicinity of Poughkeepsie," in both 

 of which the results of original investigation were de- 

 scribed, and "Embryonic Forms of Limulus polyphe- 

 mus" in which many interesting facts, as developed by 

 various naturalists, were collated. 



The last stated meeting was given up to microscopic 

 work. Professor Cooley showed some rare and beau- 

 tiful forms of microscopic crystals of gold, and de- 

 scribed their artificial formation. Mr. Arnold showed a 

 number of rock sections, and the chairman exhibited 

 some of the minute crustaceans of our ponds. 



With this varied list of subjects the evenings have 

 been filled out to their utmost capacity, and profitably 

 filled. It is proper for me to state also that, in addition 



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