CENTEAL SCIENTIFIC CO., CHICAGO, U. S. A. 



No. 1251. 



No. 1250. 



No. 1236. 



Thoma Ruling. 



No. 1254. 



COLORIMETERS for Blood Testing, see general heading Colorimeters. 



1236. CULTURE TUBE, Keidel Vacuum, for Blood, modified by Judd and Simon for culture work. 

 Consists of a tube with, a capacity of 50 cc drawn out to a capillary tip, into which is intro- 

 duced 15 to 25 cc of glucose bouillon containing 1.5 cc of sodium citrate. The tube is then 

 exhausted and sealed. Complete with a 24 gage hose-hub needle with stylet, heavy walled 

 rubber connecting tubing, and a glass tube for protection during sterilization, filled and sealed 

 ready for use $0.75 



1246. HAEMACYTOMETER, Fuchs-Rosenthal, for cytological investigations of the cerebro-spinal 



fluids, with counting chamber 0.2 mm deep, with two cover glasses and one mixing pipette 

 for white corpuscles, in leather ease 10.00 



1247. COUNTING CHAMBER only of No. 1246, with two cover glasses; without case 6.00 



1250. HAEMACYTOMETER, Levy, Burker-Neubauer, with Biirker double counting chamber with 



two Neubauer rulings, complete with two cover glasses, one pipette for red and one for white 

 corpuscles, in leather case. 



This new type of counting chamber (patented) differs from the old Biirker chamber in that 

 a depression is cut into the slide itself, instead of having two parallel pieces of glass ce- 

 mented on the slide across its entire width, thus doing away with the danger of loosening of 

 the sides of the cell with the drying out of the balsam cement. In the center of this depres- 

 sion are permanently fixed two rectangular pieces of glass, separated by a small moat, each 

 ruled with the Neubauer ruling. The surfaces of these rectangles are exactly Vioth milli- 

 meter below that of the slide, thus providing a solution over the ruled area of the correct 

 depth when the slide is in place. The double chamber enables both red and white corpuscles 

 to be counted at the same time, without cleaning and refilling the counting chamber.. 18.00 



1251. COUNTING CHAMBER only of No. 1250, with two cover glasses; without case 10.00 



1252. COVER GLASS only of No. 1250, size 20x26 mmxO.5 mm thick 30 



1253. HAEMACYTOMETER, Levy, Burker-Neubauer, same as No. 1250, but with Bureau of Stand- 



ards certificate for counting chamber and pipettes . 24.00 



1254. HAEMACYTOMETER, Thoma, with counting chamber with original Thoma ruling, two cover 



glasses, one pipette for red and one for white corpuscles, in leather case 12.00 



1255. COUNTING CHAMBER only of No. 1254 with two cover glasses; without case 6.00 



1258. HAEMACYTOMETER, Turk, with counting chamber with Turk ruling, two cover glasses, one 



pipette for red and one for white corpuscles, in leather case 13.50 



1259. COUNTING CHAMBER only of No. 1258, with two cover glasses, without case 7.50 



