Record. XxXix 
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.”’ 
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 
yarious 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 
