74 ADVANCED LESSONS IN PRACTICAL PHYSIOLOGY 



cup of the aforesaid instrument is divided into two compartments of 

 equal size, and has a glass bottom and detached glass top. Added to 

 it is a glass capillary tube held in a narrow metallic handle. 



Cleanse the metallic cup thoroughly with water and dry it with a 

 cloth if necessary. Also cleanse the capillary tube with water and 

 hydrogen peroxid, and then again with water. Dry it by blowing a 

 current of air through it from a rubber pouch. Fill each side of the 

 metallic cup with distilled water about three-fourths full. 



Collect a drop of blood upon the lobule of the ear of the subject. 

 Hold the end of the capillary tube horizontally against the drop. If 

 the tube is clean, it will fill rapidly by capillary attraction. Remove 



FIG. 45. FLEISCHL'S HEMOGLOBINOMETER. (Hall.) 



excess by touching its end carefully with filter-paper. Quickly put the 

 capillary tube in the water on one side of the metallic cup. Wave it 

 back and forth and finally allow a few drops of distilled water from a 

 dropper to flow through it. Fill each compartment with distilled water 

 to the brim, stirring the mixture of blood and water until completely 

 mixed. Close the cup with the cover-glass. 



Adjust the hemoglobinometer in front of a gas-lamp in a dark 

 room, so that the light is reflected from the mirror equally into the two 

 compartments. Now, move the colored glass slide until the tint of the 

 diluted blood appears to be the same as that of the colored slide. Make 

 the reading. Repeat this procedure several times, resting your eyes 

 repeatedly. Obtain an average reading. Thus, if the colors are 



