MICROSCOPIC STRUCTURE OF THE BLOOD. 



277 



though undoubtedly the determination of the amount of iron 

 would give more precise results ; the ordinary methods depend 

 upon the color. 



FIG. 147. Oliver's hemoglobinometer : e, glass cell for receiving the blood from 

 the pipet (the dilution is effected within the cell itself) ; a, standard graduations 

 made of tinted glass. To avoid multiplying these unduly, they are furnished in 

 tens per cent., the intermediate divisions of the scale being obtained by superposing 

 tinted glass riders in a graduated series from 1 to 9. (These riders are not repre- 

 sented in the figure.) The apparatus is shown of the natural size. 



Oliver's Hemoglobinometer (Fig. 147). Some of the blood, the 

 amount of whose hemoglobin is to be determined, is diluted 

 and placed in the glass cell e ; the color of this diluted blood is 

 then compared with the series of tinted glasses, the color of each 



