1902] MICROSCOPICAL JOURNAL. 45 
aperture of the objective. Mr. J. W. Gordon said he had 
listened with great interest to Mr. Beck’s explanation of 
the demonstration, and was anxious to see the examples, 
and no doubt the experiment would demonstrate the ex- 
istence and appearance of the autipoint in each case; but 
there was another and equally important image which he 
would like to see, and that was the antipoint which was 
formed in the eye, and he hoped some day Mr. Beck 
would be able to give a demonstration of this. 
A paper ‘‘On Stereomicrography,” by Prof. G. P. Gird- 
wood, of McGill College, Montreal, was read by the sec- 
retary. Prof. Girdwood’s méthod of obtainining stero- 
microphotographs was by placing the slide or object in a 
tilting frame attached to the stage of the microscope. 
The frame with the object was tilted to one side to the 
proper angle, and a photograph was taken; the frame 
was then tilted to an equal amount in the opposite direc- 
tion, and another photograph was taken. Prints from 
the negatives were then mounted in the usual way, to 
form stereoscopic pictures. The paper was illustrated by 
a diagram on the blackboard, and a specimen of the stereo- 
scopic photographs, placed in a stereoscope, was passed 
round the room. 
MANCHESTER MrcroscoPicAL SocrETy.—At the month- 
ly meeting of this Society held at the Grand Hotel, Man- 
chester, on December 5th, Prof. Sydney J. Hickson, M.4., 
DD. Se., F. R. 8., delivered his Presidential Address on 
the subject of Fertilization. He said that modern re- 
searches have cleared away a great many false hypothe- 
ses as to the nature of fertilization, and had thrown much 
light on the biological meaning of the process. The study 
of the Protozoa had conclusively proved that the germinal 
cells were originally equal in bulk as well as being equiva- 
lent in function. The differentiation into ova and sperma- 
tozoa is characteristic of the Metazoa, as is accounted for 
