NEW YORK COLLEGE OP PHARMACY. 
151 
respective qualities, without prejudice or favor, be made 
known; for already some bearing that warrantee have 
appeared in this market, which did not come up to the 
standard to which you lay claim — I allude to Oxyd of Zinc 
(which, in the hands of one of our members, exhibited a 
strong effervescence when submitted to the action of a di- 
luted acid,) and Precipitated Chalk, whose decided saline 
taste at once disclosed the imperfection of its preparation. 
We have hitherto been in the habit of sending to England, 
in confident expectation of invariably obtaining there the 
most perfect preparations; and we sincerely hope, that not 
only you, but every other chemical manufacturer in that 
country, will avoid affording us any inducements for re- 
peating similar remarks. Having herein expressed to you 
the decided opinion of the Board of Trustees of the College 
of Pharmacy, 
I remain, Sir, 
Your obed't servant, 
Const antine Adamson, 
Presd't of the same. 
To Mr. W. Bailey, Chemist, 
Wolverhampton, England. 
New York f March 20th, 1S45. 
Dear Sir, — The method of estimating the per centage 
of mercury, which I adopted in examining the sample 
lately for J. S. Aspinwall, Esq., was as follows: 
Twenty-five grains were placed in a glass tube, being 
first mixed with about five grains of iron filings ; the tube, 
which was green glass, was drawn out by heat to a narrow 
bore, and then bent in this (T? 
r rni • j V J'; BLUE M ASS.; 
form. This drawing repre- VZj 1 
sents the tube, with the blue 
pill mass in it, and the space 
it occupied in the tube. Heat 
was gently applied, and gra- 
dually increased by the flame of a spirit lamp, aided by a 
