114 Scientific News. (January, 
vations on species detected near Buffalo, N. Y., by D. S, Kell- i 
cott | 
tt. ae | 
It would have been a convenience if the papers had beet” 
classified. 
DESTRUCTION OF MICROSCOPICAL ORGANISMS IN POTABLE WATER 
—Langfeldt, in seeking for a substance which would kill the living | 
organisms without injuring the water for drinking purposes, found € 
that citric acid (% gram per litre of the water), killed all except € 
yclops and those with a thick epidermis, within two minutes. | 
:0: 
SCIENTIFIC NEWS. 
— In his interesting sketch of the progress of American min | 
' eralogy, delivered before the American Association for the Ad f 
. vancement of Science, at Montreal, Professor G. J. Brush, after 
speaking of the survey of the country adjacent to the Erie canal : 
in 1820-24 by Professor Amos Eaton, who was placed in charge © 
of the Rensselaer Polytechnic Institute, at Troy, says: “ It may 
be interesting here, in these days of summer schools, to recall, | 
although parenthetically, that what was probably the first sum- 
mer school of science in the United States, was established more 
than fifty years ago in connection with this institution. The 
school consisted of a flotilla of towed canal boats, and the route 
was from Troy to Lake Erie. It took two months for the trop, 
and all important points on the way were visited. Instruction bý 
lectures and examinations was given in mineralogy, geology, 90 
to 
also scientific books for reference. The students were taught the: 
method of procuring specimens, and were required to make col 
lections of wh . a 
— The Agassiz Associatio izati the $t 
; n, an organization started by the < — 
Nicholas m i 8 A re by 
w ) uss inthe meetings of their chapters 
objects they discover, and to find out about them in accessi 
Mass., the founder of the 
book of the St. Nicholas’ Agassi 
to the study of natural objects, with directions for collecting and 
preserving specimens,” oh 
— The last Congress ordered the publicati following, 
T ed th on of the tolom 
entomological works which are ah in an advanced ee 
