PHILADELPHIA 
potato Cutter, Crepbines, etc. 
No. 2420 
2418 
2418. Ravenel's Potato Gotten— Cutting portion con- 
sists of a sharpened cylinder of metal with sharp- 
ened septum, mounted in a strong handle and 
nickel-plated. Will cut a cylindrical portion from 
a potato and divide it in two with one thrust. 
Very useful for student use in laboratories. Price, $1 75 
2420. Trephine, as used by Roux and others at Pasteur Institute, Paris, 
for trephining the skulls of rabbits, in rabies experiments, 
etc., with key for removing central point (diameter of trephine 
A inch). Price $2 50 
2422. Trephine with multiplying gear, aseptic, nickel-plated, as 
used by the late L. Pasteur 15 OO 
2424. Heavy Tin Foil. — The cotton plugs of the inoculated test-tubes 
or flasks are burned off at top and a small square of sterilized 
tin foil placed over the mouth and pressed down. This 
almost hermetically seals the tube and prevents evaporation, 
and drying of culture media and danger of contamination by 
moulds, etc., in the dust of laboratory working through the 
cotton plugs. Ravenel's method, per pound 25 
2426. Copper Caps for placing over the necks of small flasks in labo- 
ratory, as used by Raven el, each 1^^ 
2428. Heavy Conical Glass with round bottom, small, for macerat- 
ing spinal cord in rabies experiments, as used by Pasteur, also 
New York Board of Health 25 
75 
