PHILADELPHIA 
minimal l>older$, etc. 
No. 2540* 
2542. Ravenel Dissecting; and Operating Pan*— A rectangular cop- 
per pan tinned inside, 17 x 10, provided with hooks at the 
corners. There are four brass chains supplied, each having 
a ring at both ends. A portion of the chain is put through 
the ring forming a noose which is drawn tightly around the 
animal's legs, the chain is then drawn taut and one of the links 
engages the hook. This is done at each corner with each 
leg of the rabbit or guinea-pig. Easily sterilized and kept 
clean, each 
Larger size, for rabbits, useful in rabies experiments for hold- 
ing animal while trephining, each 
$2 50 
3^50 
Jlpparatus for Counting Colonies of 
Bacteria. 
No. 2544* 
2544. Esmarch's Apparatus^ for counting colonies on the walls of test- 
tubes in roll cultures, with sliding apertures of different size, 
and black metal background adjustable, with lens $6 OO 
85 
