haemoglobin, we simply have to multiply the ratio 
Hgb , 
Kb7c b y 5 °’ oo °- 
Example I.—Let the red cells be 525,000 and the 
Hgb 17 per cent.; what is the colour index ? 
It is x 50,000 = 1*6, as in pernicious or 
Dibothriocephalus latus anaemia. 
Example 2.—Let the red cells be 4,000,000 and 
Hgb 25 per cent., what is the colour index ? 
It is-—- x 50,000 = ‘515 as in chlorosis. 
4,000,000 D 9 J 5 
^ t )i *L °/(, 
