PART II 



H^MATOLOGY 



ESTIMATION OF THE AMOUNT OF 

 HAEMOGLOBIN 



THERE are numerous forms of haemoglobinometer now in 

 use. Two of them (Haldane's and Sahli's) are modifications 

 of Cowers' old instrument, and of these Haldane's is 

 undoubtedly the best and most accurate. Sahli's is the sim- 

 pler in use, and is sufficiently accurate for most purposes. 

 Oliver's instrument is a good one, but it has no advantage 

 over the others, and is decidedly more expensive. 



FIG. 44. COWERS' HJEMOGLOBINOMETER. 



We shall describe the method of using Cowers' haemoglo- 

 binometer, since many practitioners may possess it, and 

 indicate the differences in the technique with Haldane's and 

 Sahli's instruments. 



COWERS' H^MOGLOBINOMETER consists of two tubes 

 mounted in a small stand. One of these tubes is filled with 



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