Record. xxix 



Dr. L. W. Andrews was elected an active member. 

 Dr. H. M. Whelpley delivered a lecture on the " Progress 

 in the Study and Development of Medical Remedies. 



5 > 



April 3, 1905. 



President A. Alt in the chair; attendance twelve. 



Mr. Julius Hurter donated to the Academy a collection of 

 mollusks, containing 216 species represented by 776 speci- 

 mens, with a catalogue of the same. The thanks of the 

 Academy were expressed for the donation. 



Mr. Henri Th. A. Hus was elected an active member. 



Mr. G. E. Clement gave an outline of the system of 

 government forestry with reference to the difficulties of some 

 of the problems, the economical utilization of timber, the 

 treatment of timber with zinc chloride and creosote for the 

 preservation of wood as used for railway ties and bridge 

 timber, and of timber testing for determining the value of 

 various timbers. 



April 17, 1905. 



President A. Alt in the chair; attendance forty. 



Mr. John F. Wixford delivered a lecture on the " Purifi- 

 cation of our City Water Supply." After a brief sketch of his 

 connection with the city water works as chemist, during which 

 time the various processes for clarifying river water were 

 tried — only to be found wanting — the speaker explained in de- 

 tail his process of converting the constituents of the water into 

 coagulants, which in a great measure do the work of purifica- 

 tion. He found that the main ingredients of the water, clay, 

 carbonic acid, calcium bicarbonate, salicylic acid and mag- 

 nesia compounds, could be converted into insoluble com- 

 pounds by lime water. The process consists in adding to the 

 water a solution of ferrous sulphate and then enough hydrate 

 of lime to convert not only the metallic salt first added into 

 an insoluble hydrate but also the very constituents of the 

 water itself into insoluble compounds. The insoluble com- 

 pounds formed by the reaction of the lime on the compounds 



