86 



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



No. 1286. 



No. 1290. 



No. 1292. 



No. 1296. 



No. 1308. 



1286. HYDROGEN-ION CONCENTRATION APPARATUS for determining the hydrogen-ion content of 

 the blood colorimetrically, ai suggested by Drs. Levy, Eountree and Marriott. The outfit con- 

 sists of a series of standard colored liquids sealed in glass tubes, a wooden holder for the tubes 

 and a comparison box for matching the color of the unknown with the standard colors. Com- 

 plete in wooden case I%x4xll% inches. (See Archives of Internal Medicine, Vol. XVI, for 

 September 1915, page 389) $5.50 



1290. LANCET, Blood, with nickel-plated metal handle into which the lancet can be screwed for pro- 

 tection : 60 



1292. LANCET, Blood, same as No. 1290, but with hard rubber handle 45 



1296. LANCET, Blood, Spring, in nickel-plated handle with spring clamp, and screw to adjust 

 depth 3.00 



MICROSCOPES for Blood Testing, see general heading Microscopes. 



1308. MICRO-SACCHARIMETER, Epstein's, for the estimation of sugar in the blood, making use of 



the color change brought about by heating a mixture of sugar and picric acid in the pres- 

 ence of sodium carbonate, the depth of the color depending on the amount of sugar present. 

 With this apparatus an accurate determination may be made with as small an amount as 0.1 

 cc of blood. Complete with two standard color tubes, an accurately graduated tube for the 

 unknown, holder with opaque glass slide for the color tubes, pipette graduated to 1 cc in 

 0.1 cc divisions, capillary pipette graduated at 0.1 and 0.2 cc, tube graduated at 1 and 2.5 

 cc, two boiling tubes with holder, filtering funnel, dropper, and set of three solutions picric 

 acid, sodium carbonate, and sodium fluoride, in ease with directions for use 9.00 



1309. STANDARD COLOR TUBES. 



No A B 



Each 1.00 1.00 



1310. GRADUATED TUBE, for blood serum 1.00 



