2()0 DAVENPORT ACADEMY OF NATURAL SCIENCES. 



regular membership; Mr. L. G. Mason, Oregon, Illinois, was elected 

 corresponding member. 



A paper by Mr. R. Ellsworth Call was presented, entitled "Memo- 

 randa on a Collection of Fishes from the Ozark Region of Missouri." 

 On motion, it was referred to the Publication Committee. 



On motion, adjourned to the Academy grounds to view through the 

 telescope, Jupiter, Venus, Saturn, and the new moon, all of which were 

 in excellent position. 



June 24, 1887. — Regular Meeting. 



President C. E. Harrison in the chair; eight members present. 



Librarian reported one hundred twenty-nine additions to the library 

 during the month. 



Curator reported large donations to the museum. A number of the 

 most noticeable pieces of pottery of the late collection sent by Capt. 

 Hall, and eleven crania, were exhibited. 



A communication was read from Prof. Starr showing the thunder- 

 storm work well in hand, with sixty present and eighty prospective 

 observers, the only expense to the Academy being the printing of 

 blanks, etc. 



A communication was read from Clark Bell, Esq., President of the 

 New York Medico-Legal Society, offering to send the Quarterly Journal 

 of that society in exchange for the Proceedings of the Academy. 



A paper was read from Prof. Starr containing an account of the ex- 

 ploration of four mounds in Floyd county, Iowa, under his immediate 

 supervision. Referred, on motion, to Publication Committee. 



Mr. Pratt gave an account of a large number of stone circles, similar 

 to those described by Prof. Starr, inspected by him in Dakota, in 

 localities where no trace of mounds or evidence of human presence, 

 near or remote in time, was discernible. 



Some interesting excerpts were read from a paper on " Fresh Water 

 Animals/' by Prof. Marshall, of the Manchester (Eng.) Microscopical 

 Society, reciting a series of experiments carried on for the space of 

 three years, which went to show that the differences between several 

 distinct species of marine animals depend simply on the percentage of 

 salt in the water in which they live. They were changed under the 

 eye of the observer back and forth at will, by gradually adding fresh 

 water to the tanks in which they are kept. 



Prof. Pratt then brought up for discussion the subject of the "Spectra 

 of Heated Iron." 



