xxii Trans. Acad. Set. of St. Louis. 



the form of the tension briquette, in which the stress should 

 be more uniformly distributed ; and the other, a mixing of 

 two fairly uniform sizes of sand, oue of which should just 

 about fill the interstices of the other, so as to develop the 

 benefits of fine grinding of the cement, which, it was ex- 

 plained, were lost when large gaps remained between the 

 particles of sand, to be filled by the cement. 



April 4, 1898. 

 No quorum present. 



April 18, 1898. 



President Engler in the chair, eighteen persons present. 



Mr. Carl Kinsley read a paper on Series Dynamo Electric 

 Machines. 



Professor J. H. Kinealy made some informal remarks on 

 the ventilation of schools, and by means of stereopticon views 

 showed the different methods adopted for supplying the air re- 

 quired for ventilation to the different rooms of school houses. 



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

 active members: W. P. Eberlein, Alexander Euston, Harold 

 H. Tittman, George F. von Schrader. 



One person was proposed for active membership. 



May 2, 1898. 



President Engler in the chair, sixteen persons present. 



Mr. M. L. Holman, Water Commissioner of St. Louis, 

 made an informal address on Present Methods in Water 

 Filtration. He described the municipal systems of water 

 filtration used at Hamburg, Berlin and other German cities 

 which he had visited, and spoke of the problems to be solved 

 in designing a filter plant for St. Louis. He spoke of the 

 different methods of coagulating and getting rid of mud and 

 sediment in water, and said he thought it was probable that 



