NOTES. 509 
of the American Association for the Advancement of Science, of 
which he was president at the meeting held in Salem in 1869, and 
for many years has taken an active part in the proceedings of the 
Association. 
Prof. Henry James CLARK died at Amherst, on July ist, at 
the age of forty-seven. Prof. Clark first became known to the 
scientific world as a very promising student with Prof. Gray. 
He afterwards, and for twelve years, was associated with Prof. 
Agassiz as an assistant. In 1860 he was made adjunct professor 
of Zoology at Harvard, and afterwards held professorships at the 
Agricultural College of Pennsylvania, the University of Kentucky, 
and finally in 1872, at the Massachusetts Agricultural College at 
Amherst, where after much suffering his useful work was termi- 
nated. Prof. Clark was probably the most thorough histologist 
in this country, and was our best microscopist in the general ac- 
ceptance of the term. His volume entitled “ Mind in Nature” 
published some ten or twelve years since was the result of his 
micro-physiological studies. He was a large contributor to Prof. 
Agassiz’ volumes on the Natural History of the United States, and 
| he has also printed many important papers in the Memoirs of the 
American Academy, the Boston Society of Natural History, and 
various scientific journals. We understand that the Smithsonian 
Institution was publishing an extensive work by Prof. Clark, which 
we trust will not be delayed by his death. Prof. Clark was a- 
member of the National Academy of Science and of the leading 
Scientific societies in the country. 
Ir appears that the scientific results of the voyage of the Pol- 
aris, as revealed by the examination by the Secretary of War of 
Capt. Tyson and his comrades, when the vessel is rescued, as there 
are strong hopes she. will be, promise to be very encouraging to the 
advocates of farther arctic explorations. The Polaris reached 82° 
62’ north, where she was in the new straits she had discovered. 
The dredge was not used, but the records of the astronomical, 
meteorological, magnetic, tidal, and other departments of explo- 
ration appear to have been full, while the collections of natural 
history, including skins and skeletons of musk oxen, bears and 
other mammals, birds and eggs, marine invertebrates, plants and 
fossils, were very numerous. 
Specimens of drift wood of the walnut, ash and pine were said 
+ 
