THE SKELETON AND ITS JOINTS 
357 
the neutralization of this acid, or it is due to the combina- 
tion of all these factors acting through their influence on 
the ductless glands. 
It is important also that while this disease is very 
common among the Cebidae it has never been found among 
the macaques. This may be due to the fact that, owing to 
the storage sacs in the mouth of the macaques, more food 
proportional to body weight is consumed, or there may 
be an essential difference in the basal metabolism of the 
families and individuals. All the factors enumerated do 
tax the metabolic resources of the body and depress the 
functions of the endocrine glands. Only detailed and 
accurate quantitative studies of normal metabolism and 
the effect of alterations of it on the ductless glands will 
give a more definite answer to the problem. 
This work indicates clearly the alterations to be made 
in the diets to meet the requirements of the Cebidse and 
is to be followed by investigations along similar lines 
for other families. 
Table 17. 
A List of the Orders Exhibiting Definite Lesions 
of Osteomalacia and Rachitis. 
Osteom 
ilacia 
Rachitis 
Primates 
29 
4 
3 
2 
5 
1 
3 
9 
2 
12 
9 
44 
35 
10 
Lemures 
2 
Carnivora 
8 
Hyracoidea 
1 
Rodentia 
3 
Marsupialia 
10 
Passeres 
34 
Psittaci 
Accipitres 
Columbae 
Galli 
79 
34=113 
Having discussed the nature of these diseases and 
some of the factors in their causation, analysis of their 
distribution may be appropriately added. The accom- 
panying list (Table 17) illustrates the orders in which the 
