PHILADELPHIA 
Petri DisDcs, etc. 
No. 2028 No. 2618 No. 2626 
2618. Petri Dishes for student or general bacteriological work, lo 
cm. diameter. 
Each . . ■ $0 25 
Per Dozen 2 50 
Per Gross 25 OO 
2620. Petri Dishes^ better grade for general bacteriological work, clear, 
well annealed and comparatively free from bubbles and 
striations ; well ground ; lo cm. 
Each 30 
Per Dozen 3 OO 
Per Gross 30 00 
2622. Petri Dishes, finest grade, heavy dish, well ground and well an- 
nealed, flat, clear, without bubbles, and almost free from 
striations. Special for finest work, water analysis and accurate 
colony, counting lo cm. diameter. 
Each 35 
Polished top and bottom, per dozen 3 50 
" " " " per gross 35 OO 
2624. Petri Dishes. 
6 cm. diameter, each 20 
6 " " per dozen 2 40 
8 " " each 24 
8 " " per dozen 2 75 
2626. Ravenel's Petri Dish Holder. Of steel wire, nickel-plated, all 
joints brazed. An excellent holder or clamp for three dishes. 
Price, each 50 
For five or six dishes, lo cm., price, each 60 
Especially useful in water and milk analysis. 
2628. Heavy Glass Dishes. Size, 9 inches diameter, for attaching a 
wooden clothes-peg with hole drilled to receive tubing. After 
Ravenel. A very useful receptacle is thus formed for the 
laboratory table to receive the drippings from distilled water 
bottle placed higher on a shelf, or to catch the drip when stain- 
ing slides and covers. A Mohr's pinchcock and glass tube drawn 
to a point not shown in cut, is required to make this com- 
plete. Each 1 21% 
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