162 
CORRESPONDENCE. 
best treated with dye of one grain to the ounce. Most sections require 
only from five to ten seconds immersion — rarely ten. Otherwise the 
manipulation is the same as with leaves. A compound dye of 
carmine with aniline green in powder I have found excellent in some 
leaves, as the deutzias, mature laurus, pocolonia, momordia, &c. ; and, 
for some sections, such as most woods, for longitudinal sections of 
petiole, or transverse sections, where the spirals are marked, as of the 
axilla of ricinus communis, I prefer it to other combinations. As 
the quantity required for any given staining is a good deal less than 
a grain, and as the anilines differ in strength, no formula can be 
given. I usually put six or eight average granules of the powder in 
twelve drops of carmine, stirring well together. Green may be 
mingled in the same manner with logwood. 
Mr. Peet means to continue his papers on this subject in a future 
number of the same journal as the present one has appeared in. 
CORRESPONDENCE. 
Professor Holmes’ Address. 
To the Editor of the ‘ Monthly Microscopical Journal.’' 
Boston, August 6, 1877. 
Dear Sir, — May I ask a little of your valuable space for the 
purpose of correcting an erroneous impression that will probably be 
caused by the reference, in your July number, to the address of 
Professor Holmes before the Boston Microscopical Society. 
You will find in the accompanying copy of the address that due 
credit is given to the labours of Schlciden, Schwann, and Ehrenberg ; * 
their works form part of the elegant library of Professor Holmes ; 
more than that, as Professor of Anatomy in Harvard Medical School, 
he yearly imparts the results of their labours to his classes ; he has 
probably done more than any teacher in our profession in America to 
encourage microscopic research. We felt that the Nestor of medical 
microscopy in America was an eminently fitting personage to deliver 
the first address before our Society. 
It is true that he is known rather as a creator in the domain of 
art than as an observer in the fields of science ; considering the nature 
of the work demanded of the Professor of Anatomy in America for 
the last thirty years, it is hardly wonderful that Pegasus slipped the 
yoke. It may be interesting to know that he is still a faithful 
teacher of anatomy, and interested in the latest results of histological 
research. 
May I add the following translation from Y. Baer’s ‘ Entwickelungs- 
* We have received this address, but we see in it nothing that leads us to 
modify our original remarks. — Eij. ‘ M. JI. J.’ 
