Ixxiv 



Afril 3, 1882. 



The President in the chair. Seventeen members present. 



Mr. Engler gave a short lecture on cosmopolitan time systems. 



Mr. Nipher read a paper entitled, " On a Property of the Isen- 

 tropic Curve for a Perfect Gas, as drawn upon the Thermody- 

 namic Surface of Pressure-Volume-Temperature." 



Ap-il 17, 1882. 



The President in the chair. Twelve members present. 



Dr. Todd presented segments of the trunk of the elephant, and 

 made some remarks on the anatomy of the same. He also exhib- 

 ited the jaws and teeth of a young elephant, and explained the 

 dentition of the animal and the structure of the teeth, by means 

 of polished cross-sections. 



Dr. Engelmann presented an orange containing another orange 

 enclosed. 



Mr. Leonhard presented a list of minerals found in Missouri, 

 and called attention to some of the more important species. 



He also exhibited a collection of meteorites containing one spe- 

 cimen which was supposed by Dr. Hahn to contain a fossil coral. 



May I, 1882. 



Dr. Engelmann in the chair. Eight members present. 



Mr. C. S. Smith presented a map showing the area covered by 

 the tornado of April iSth, 18S0, within the limits of the city of 

 Marshfield. 



Dr. Engelmann made the following communication on the 

 temperature of the present spring : 



The past April was not as warm in proportion as March or February, 

 but still it has been 2.5 degrees above the normal, so that since December 

 every month of the five was above the normal, December and March 

 giving the greatest excess, and January and April the least. The average 

 of the five months was 4°. g above the normal, and this in our variable 

 climate is no unusual thing. Only two years ago we had just such a 

 mild winter and an early spring, and after it the fruitful season of 1880. 



