420 | Scientific News. [ May, 
microscopes. Only a limited number of students can be accommo- 
dated ; and applicants should state the amount of their previous 
experience in such work. 
Microscopic OpyEcts.—Mr. M. A. Booth, of Longmeadow, 
Mass., is furnishing unmounted objects, by mail, at the price of 
one dollar for twenty-five packets. Printed lists of the objects 
offered can be obtained from him. 
Mr. Geo. W. Morehouse, of Wayland, N. Y., has issued a list 
of mounted objects, chiefly animal substances and preparations of 
various kinds, which he is offering for sale at thirty cents each, or 
four for one dollar. - 
Mr. David Folsom, of Chicopee, Mass., has also undertaken to 
prepare objects for sale, or mount them to order. 
:0: 
SCIENTIFIC NEWS. 
ually verified by new discoveries springing up all over the earth. 
This point was illustrated by some of his own observations on the 
development and anatomy of certain fishes, of which he had 
made a special study. 
flows by levees, and other operations attendant upon the yess! 
ec 
primeval nature. 
— The fourth session of the Marine Laboratory maintained / 
the Johns Hopkins University in connection with its bie 2 
department, will commence at Beaufort, N. C., May 2, 1881. ra 
session will continue until the end of August. Dr. W. K. Brooks, 
