66. Tur Microscope. 
margarine and butterine are concerned, he clearly endorses my 
published statements, but strange to say, he has not even made 
an ‘attempt, by my methods, to discover lard or other fat crys- 
tals in oleomargarine and butterine as sold in the markets. As 
soon as I have an opportunity I will point out where he has 
wholly failed to comprehend my work. The chemists of the 
Ag. Dept. have now demonstrated the truth of my published 
statements on this subject. The important point which experi- 
menters seem to lose sight of, is that the object is to detect 
the presence of foreign fats in butterine instead of the presence 
of butter, and that to find out whether butter is pure or not 
we must find whether lard or other fat crystals are present in it. 
Yours truly, 
Tuomas Taytor, M. D., 
Microscopist of the Dept. of Agriculture. 
P. S. Had Prof. Weber read my full report instead of only 
the abstract, he would not have made the above mistake. 
NEW METHOD OF FIXING SECTIONS TO THE SLIDE. 
H. E. SUMMERS, CORNELL UNIVERSITY. 
ee following method has been tested with paraffin and cel- 
loidin sections. For either kind of sections the slides are 
first coated with collodion, either by flowing from a bottle or by 
a brush, and allowed to dry. The celloidin used for embedding, 
thinned with alcohol and ether, answers admirably. The coated 
slides may be kept indefinitely before using. 
Paraffin sections are arranged upon the slide and a small 
amount of a mixture of equal parts of alcohol and ether is then 
dropped upon the slide. The liquid will be immediately drawn 
under the sections. Bubbles of air wil! rarely remain beneath 
the sections, but if they do, they may easily be displaced by 
gently touching the section with a soft brush’ The liquid is 
allowed to evaporate spontaneously. When quite dry, which 
will take but a few minutes, the paraffin may be dissolved and 
the sections will be found firmly fixed. 
Celloidin sections are placed for a few minutes in 95% aleo- 
hol, and then arranged on the coated slide. They are drained 
as free of alcohol as possible, and as soon as their surface is 
