xliv Trans. Acad. Set. of St. Louis. 



on his observations, while examining the water of the Missis- 

 sippi river near St. Louis, to test the influence of the Chicago 

 canal upon the water supply of St. Louis. He explained the 

 importance of carefully collecting the samples for examina- 

 tion purposes, and their careful preservation in a condition 

 and temperature as near as possible, as when taken, which 

 frequently requires keeping them on ice to prevent further 

 development, increase or decrease of the number of bacteria 

 contained in the sample, thereby securing perfect results. 

 He also exhibited the apparatus and methods used in such 

 examinations. He also showed by black-board drawings and 

 charts how the number of bacteria varies at different points 

 of the same bod}^ of water, according to their location near 

 cities or sewage outlets, and other conditions and influences. 

 Professor F. E. Nipher made some remarks on the methods 

 used for measuring wind- velocities, to determine the pres- 

 sure, which latter is generally adopted as being equal to the 

 square of the velocity. But he feared, that the old method 

 by means of pressure boards gives no satisfactory measure for 

 determining the pressure of a heavy wind on high buildings ; 

 therefore other methods were desirable for this object. 



Reports or Officers for the Year 1904. 

 The Treasurer reported as follows : — 



RECEIPTS. 



Balance for 1903 $ 563 43 



Membership dues 1,444 15 



Voluntary contributions 344 00 



Rent from building 355 00 



Notes discount 3,750 00 



Interest 278 49 



Capital released 3,000 00 



$9,735 07 



