[CAMERON] THE HUMAN SKULL 183 



recognise the dental formula. The effect of this defective dentition 

 is reflected in the correspondingly feeble degree of development of 

 the jaws which are consequently both contracted and retracted. For 

 this condition the writer has suggested the term "retrognathism." 



16. The cranial outline in microcephaly sometimes shows a rever- 

 sion back to the stage of the Java man-ape, and not only that, but 

 may even compare unfavourably both in dimensions and capacity 

 with his cranium. According to the Darwinian theory this fact 

 would contribute its testimony in fixing Pithecanthropus erectiis as an 

 ancestral stage in the evolution of man, 



17. As this research progressed it became increasingly evident 

 that the present paper would have to be regarded as a preliminary 

 communication. It is therefore intended to treat each of the five 

 sections separately, and more exhaustively in subsequent memoirs in 

 order to be able to deal effectively with the subjects and do anything 

 like full justice to the vast issues that are involved. 



