162 
is removed, and in its place is attached a small lamp fed with 
Petroleum oil. In this way it can be passed from hand to 
hand around a class, and the source of illumination be 
always under the control of the observer. Prof. E. stated 
that he had two of this form of microscope, besides others, 
in continual use in his classes, and found them to answer 
every purpose required. 
Pror, Epwarps said that he desired to place upon record, 
another example of the introduction of an exotic animal into 
this section of country. This was an alligator, which he had 
found alive on the 25th of last June, 1870, in a small stream 
running through a meadow by the road-side, on the island of 
New York, near Inwood, which is at the farther end of the 
island. It was eight or ten inches long, striped transversely 
black and orange-yellow, and extremely lively, swimming 
away down stream on being disturbed. The source of this 
creature had not been ascertained, and on examining those 
in the collection at the Central Park, they were found to be 
totally different in color. 
February 13, 1871. 
Pror. C, A. Joy in the chair. ‘Twenty-six persons present. 
PRESIDENT BARNARD presented, in the name of the author, 
Brevt. Lt. Col. J. J. Woopwarp, twenty-four Photo-micro- 
graphs, with accompanying explanatory text, illustrating the 
use of Magnesium, Electric and Oxy-calcium lights in Photo- 
micrography, and the Histology of Minute Blood-vyessels. 
Pror. A. M. Epwarps made some remarks explanatory 
of the great beauty and value of these contributions to 
science, and proposed a vote of thanks to Dr. Woodward for 
his generous gift; which was passed unanimously. 
