en. xxix.] 



H^EMOGLOBINOMETERS 



471 



This keeps unchanged for years. A stream of coal gas is passed through the blood 

 to be examined. This converts all the haemoglobin present into carbonic oxide 

 haemoglobin ; this is then diluted with water to match the standard. 



FIG. 336. Hsemoglobinometer of Dr Gowers. 



Von Fleischl's Haemometer. The apparatus (fig. 337) consists of a stand 

 bearing a white reflecting surface (S) and a platform. Under the platform is a slot 



Fia. 337. Von Fleischl's Htemoglobinometer. 



carrying a glass wedge stained red (K) and moved by a wheel (R). On the platform 

 is a small cylindrical vessel divided vertically into two compartments, a and a' 



