RED BLOOD CORPUSCLES AND THE HEMOGLOBIN. 



485 



Table III. — Average erythrocyte counts and hcemoglobin estimations^ on ' 601 

 American soldiers who at the date of the first examination had served on the 

 average 6.6 months in the Phijippines. 



Dates of examinations. 



May and June, 1910 . 

 May and June, 1911 . 



Average 

 number of 

 erythrocytes | 

 per cubic , 

 millimeter, i 



Average 

 haemoglo- 

 bin. 



5,111,000 

 .5,206,000 



Average 

 color 

 index. 



Per cent. 



90.3 i 

 89.6 ' 



0.88 

 0.86 



It will be seen that in character our blood examinations agree with 

 those of Wickline, although the alteration which he found with increasing 

 length of tropical residence are not as pronounced in our series as in his. 

 Our average erythrocyte counts at different periods range from 5,111,000 

 to 5,355,000, and the average haemoglobin readings from 88 to 90 per 

 cent. The color index is consequently considerably below unity, varying 

 from 0.82 to 0.88. 



In Tables IV and V is shown the range covered by the individual red 

 counts and hgemoglobin estimations for a body of healthy American sol- 

 diers, who at the date of examination had seized in the Philippines for 

 an average of twenty months, the length of this service being for no 

 man less than fourteen months. These tables include all the examina- 

 tions that are shown in the last column of av-erages in Tables II and 

 III, together with a few others which were not entered in Tables II and 

 III because there were no preliminarj'' examinations for the individuals, 

 concerned. 



Table IV. — Range of erythrocyte counts for 687 healthy American soldiers who 

 at date of count had served on the average twenty months in the Philippines. 



Range of erythrocyte count 

 per cubic millimeter. 



Under 4, 000, 000 



4, 000, 000 to 4, 249, 000 

 4,250,000 to 4, 499, 000. 

 4, 500, 000 to 4, 749, 000. 

 4, 750, 000 to 4, 999, 000 

 6,000,000 to 5, 224, 000 

 5,225,000 to 5, 499, 000 



Number 

 of men. 



Per cent 

 of total 

 number. 



15 



2.2 



26 



3.8 



37 



5.4 



60 



8.8 



112 



16.3 



155 



22.5 



77 



11.2 



Range of erythrocyte count I Number 

 per cubic millimeter. i of men. 



5, 500, 000 to 5, 749, 000 i 76 



5, 750, 000 to 5, 999, 000 ' 39 



6,000,000 to 6,224,000 i 35 



6, 225, 000 to 6, 499, 000 I 24 



6, 500, 000 to 6, 749, 000 \ 12 



6, 750, 1 00 to 6, 999, 000 j 14 



Over 7, 000, 000 i 5 



Per cent 

 of total I 

 number. I 



11.1 

 5.6 

 5.1 

 3.5 

 1.7 

 2.1 

 0.7 



