Record. xlv 



May 6, 1895. 



President Green in the chair, sixteen persons present. 



Professor J. H. Kinealy gave the results of some tests of 

 ventilation made for the Board of Public Schools, which 

 showed great lack of uniformity in the ventilation of the 

 various schoolrooms and demonstrated the presence of an 

 undue amount of carbon dioxide in the air of these rooms. 



Mat 20, 1895. 



President Green in the chair, eleven persons present. 



The Corresponding Secretary reported on a recent experi- 

 ment by Professor Ramsay, who, in boiling a rare mineral, 

 cleveite, with dilute sulphuric acid, obtained a gas which 

 showed the same spectrum as the -helium line in the solar 

 spectrum. 



Dr. John Green read a note on the variation in the power 

 and in the astigmatism of thin spherical, toric and cylindrical 

 lenses, in principal cases of oblique centrical refraction 

 through the lens; this was followed by a general discussion 

 of the ifature and correction of astigmatism in the eye. 



June 17, 1895. 



President Green in the chair, twenty-five persons present. 



Professor C. R. Sanger discussed the chemistry of photog- 

 raphy, with respect to the formation and development of the 

 latent image, the fixation of the developed image, and the 

 printing and toning of the positive. 



The following persons, resident in St. Louis, were elected 

 active members: — Christoph. Winkelmeyer, Rudolph Hart- 

 mann. 



October 21, 1895. 



President Green in the chair, nineteen persons present. 

 Professor Trelease read a paper by L. H. and Emma Pam- 

 mel, on the gases produced by certain bacteria. 



The President announced the death of Professor C. V. 



