156 
On a Simpite Metuopn of applying the Compounp MicroscoPE 
to the Urrer or Lateran Surraces of Aquaria. By 
Perer Reprern, M.D., London University, and King’s 
College, Aberdeen. 
(Read at the Dublin Meeting of the British Association, in August, 1857.) 
Iv is important and convenient to have some simple 
method of examining objects in Aquaria with the compound 
microscope without disturbing them from day to day. The 
plan adopted by Mr. Warrington, and described in the 
‘Microscopical Journal,’ admits of the instrument being 
adapted to a limited surface with facility; but it is often 
desirable to be able to apply it to any part of a surface 
measuring two feet or more in extent. This end is gained 
by the arrangement described below. 
The woodcut shows the instrument in the position requisite 
( 
for examining the contents of a bowl standing on the table, 
or objects near the upper suriace of the fluid of an aquarium. 
a is a heavy cast-iron foot, seven inches in diameter, into 
which a vertical stem, 6, made of ordinary one-inch brass 
tubing, two feet long, is firmly screwed or soldered. c is a 
