Tue Microscope. 201 
In conclusion I wish to say that by following the general 
line of investigation indicated in this paper we are able to 
distinguish human from animal hair. 
Pi THE PRESIDENT’S ADDRESS. 
i the evening, Ex-Governor Cox, president of the society, de- 
livered his annual address in the city hall. The speaker was 
introduced by Professor 8. A. Lattimore, of the University of 
Rochester. The address was in one sense a memorial of one of 
the most distinguished members of the society, Robert B. Tolles, 
one of the pioneers in the introduction of modern wide angled 
lenses, and in whose death, which occurred within the last 
year, the scientific world sustained a great, almost an irrepara- 
ble loss. The speaker gave a historical sketch of the great de- 
bate over the practicability of enlarging the aperture of micro- 
scope objectives beyond the maximum angle in air in which 
Tolles’ part was by common consent the leading one practically. 
President Cox endeavored to show by a careful review of the 
discussion that Tolles deserved to rank high in it for clear and 
accurate scientific comprehension of the principles to be applied, 
and that he had passed beyond the field of the skillful artisan 
into that of a systematic and able investigator who worked to- 
ward valuable results by the proper application of well under- 
stood laws. It was evident that the address embodied the re- 
sults of a vast deal of study and research. It will constitute a 
valuable contribution to the records of the society which have 
not hitherto contained a connected account of the controversy 
which resulted in the triumph of very important improvements 
in the microscope, which had their origin and their first conclu- 
sive theoretic demonstration in this country. The address oc- 
cupied an hour and a half in its delivery. It was listened to 
throughout with the closest attention, and at its conclusion the 
speaker was warmly applauded. 
—_—_< 6 p>—_- 
We are in receipt of two fine engravings of “ Eminent 
Men” and “ Eminent Women,” from The Travelers’ Insurance 
Company, through their consulting surgeon, Dr. Wm. J. Lewis. 
pany, s ) 
2 
