66 TRANSACTIONS OF THE [FEB. 23, 
tana and Colorado may soon look to a supply of lead ore from 
Kootenai in the shape of concentrates, of which they have been, 
to their great loss, deprived by the exclusion of Mexican sul- 
phurets by our tariff. 
The following papers were then read: 
THE PRECIPITATION OF SUSPENDED SILT AND CLAY IN RIVER 
WATERS 
and 
THE DISCOVERY OF A STARCH-DIGESTING FERMENT IN COW’S 
MILK, AND ITS RELATION TO NUTRITION. 
BY PROF, A. R. LEEDS, 
(No Abstracts. ) 
February 16th, 1891. 
STATED MEETING. 
VicE-PRESIDENT Dr. HUBBARD in the chair. 
About one hundred persons present. 
The minutes of February 9th were read and approved. 
The fourth lecture of the Public Course was delivered by 
Pror. WaLLAce Gooxtp Levison, of Brooklyn, N. Y., entitled 
INSTANTANEOUS PHOTOGRAPHY AS AN AID TO SCIENCE, HIS- 
TORY, AND ART. 
Illustrated by a large number of novel lantern views. 
At the close of the lecture a vote of thanks was offered to the 
lecturer. 
February 23d, 1891. 
ANNUAL MEETING. 
- Vice-PrESIDENT Dr. Hussar in the chair. 
About twenty-five persons present. 
~The minutes of February 16th were read and approved. 
