THE BLOOD 



247 



standard tint at 60 divisions, the blood contained but 60 per cent, of the 

 normal amount of hemoglobin. 



FIG. 99. HALDANE'S MODIFICATION or COWERS' APPARATUS. 



Haldane's Modification of Gowers' Method. Haldane's hemoglobin- 

 ometer, Fig. 99, is a modification of that of Gowers. The tube A contains 



FIG. loo. VON FLEISCHL'S HEMOMETER. K. Red colored wedge of glass moved by R. 

 G. Mixing vessel with two compartments, a and a'. M. Table with hole to read off the percentage 

 of hemoglobin on the scale P. T. Pinion to move K. S. Mirror of plaster-of-Pans. 



also a i per cent, solution of blood having the normal percentage of hemo- 

 globin saturated with carbon monoxid. With the graduated capillary 

 pipette, D, 20 cubic millimeters of blood are then obtained from a slight 



