1887.] MICROSCOPICAL JOURNAL. 71 
it is a great satisfaction to get rid of the terrible acid fumes when operating 
upon large quantities. I do not consider the process perfect, however, and 
hope to improve upon it hereafter. 
BrisToL, Conn., Mar. 22, 1887. 
MICROSCOPICAL TECHNIQUE. 
Improved settling tube for urinary deposits. 
By F. VANDERPOEL, 
OF NEWARK, NEW JERSEY. 
Fig. 1. Fig.2. i g Le 
PLATE 3.—Vanderpoel’s settling tubes. 
In the February number of this Jowrzal the writer described a new set- 
tling tube for urinary deposits which possessed several advantages over the 
old method with conical test-glass and pipette. For several reasons, how-. 
-ever, the article was not illustrated, and it is for the purpose of elucidation, 
by means of illustration, as well as to bring before the readers of the ,/ozz7- 
nal two new and improved forms of the tube, that space in these columns is 
again sought. ‘The first two of the figures, 1 and 2, represent the tube as 
originally devised ; 1 denoting the tube with movable cap secured to it by 
means of a rubber band, and 2 the tube with a ground-glass cap and stop-cock. 
The first departure from these forms is shown at 3, and consists of a conical 
tube, as before, but provided with a perforated stopper, the side opening in 
which communicates with a side tube. The perforation in the stopper, which 
is easily made by a glass-blower, thus allows the overflow, when the stop- 
per is inserted into the full tube, to pass into the side tube. The stopper is 
then turned so as to cut Off the urine in the latter from that in the large tube, 
and the latter is thus made tight. After allowing it to remain at rest long 
enough to permit subsidence of all that will settle, the stopper is gently turned 
