442 CHAMBERLAIN. 



From the foregoing it is concluded that the differential and the 

 Arneth counts of this small series of men throw no light on the question 

 of the relative resistance of the two complexion types. 



Urinary examinations.- — An examination of the urine was made on 

 all of the men of the 1910-Grroup, once near the beginning and once 

 near the end of the observation period, with a view to detecting any 

 cases of nephritis. At the final examination albumin was found in 3 and 

 casts in 3 of the brunettes while none of the blonds showed albuminuria 

 and only 2 had casts. We attach no significance to these differences 

 because of the small number of cases. An examination of the specific 

 gravity averages are of some interest. The specific gravity of a single 

 specimen of urine is of course in itself of little value, but when the 

 specific gravity readings of single specimens from several hundred men 

 are averaged the results have considerable importance in the direction of 

 showing the condition of the group as regards renal elimination. It has 

 been urged by some that in the Tropics there is a tendency to renal 

 insufficiency, while others have considered that, as a result of excessive 

 loss of fluid in the form of perspiration, the urine becomes too concen- 

 trated and is therefore irritating. The following table shows that the 

 average specific gravity readings for the blonds and for the brunettes 

 showed no differences worthy of consideration, and also that for both 

 types the figures were those that are considered normal in the temperate 

 zone. This latter opinion is based on 1,152 readings on 576 individuals 

 which gives an average specific gravity of 1,019.8. The average 84-hour 

 amount of urine is not known. 



Table XVIII. — Gomparative average specific gravity readings for urine of 29Jf 

 blonds and 282 brunettes, comprising 1,152 separate examinations, 1910-Group. 



Type. 



Second quarter. 



1910 



1 

 19U 



Blond -- — 



1,019.6 

 1,020.2 



1,019.5 

 1,019.8 



Brunette _ - . 







Stool examinations. — At the completion of the year of observation, 

 examinations were made of the stools of 308 blonds and 293 brunettes 

 of the 1910-Grroup in order to determine if the two types showed any 

 differences in the degree of infestation with intestinal parasites, especially 

 uncinaria. No special search was made for amcebaj and no cathartic 

 was given before obtaining the specimens. Three cover glass preparations 

 were examined for each individual. The results are shown below. 



