DR DUBOIS ON PITHECANTHROPUS ERECTUS. 95 



I may say that the relation found empirically is in accordance with 

 theory ; however that theory only conducted me in a general way. 

 It is not my intention to enlarge on the topic of this relation, 

 interesting though it may be, I now only want it for the purpose of 

 its application to the femur of Pithecanthropus erectus. 



Comparing the femur of Pithecanthropus erectus with human 

 thigh bones, of which the body-weight belonging to them was 

 known, it was now also possible to calculate with some approxima- 

 tion to accuracy the body-weight of Pitheca}itJiropus erectus. I 

 found it to have been about 70 to 75 kilogrammes. 



Taking 70 kilogrammes as the basis of calculation, and admitting 

 the exponent r to be 0-56 or 0*25, I found the cephalisation of 

 Pithecanthropus erectus to be nearly the half of that occurring in 

 Man and nearly the double of that occurring in the AntJiropoid apes. 



I have pointed out already how far individual variety of the size 

 of the brain in man oscillates, not taking into account the size of the 

 body. The variety of the size of the brain accompanying a given 

 body-weight certainly remains very much below that absolute 

 variety, so that, even as an individual limit, the cephalisation of 

 Pithecanthropus erectus would be far below that of even the 

 smallest-brained normal human being and far above the most 

 cephalisated Anthropoid ape. 



From all these considerations it follows that PithecantJiropus 

 erectus undoubtedly is an intermediate form between Man and the 

 Apes. If further there is truth in our present conceptions of the 

 continuity reigning in the organic world, I cannot look upon PitJiec- 

 anthropus but as upon a real member, the first known, in our 

 genealogy. And even should we prefer not to regard him as a 

 grandfather but as an uncle, still in every case he is a most 

 venerable ape-man, representing a stage in our phylogeny. 



Prof Macalister spoke and strongly urged that researches in 

 Trinil should be continued, and moved the following resolution, 

 which was seconded by Prof. O. C. Marsh, and carried : 



" That, in the opinion of this Meeting of the members of the 

 Fourth International Congress of Zoology, the Dutch Indian 

 Government, by ordering the exploration of Trinil, Java, leading 

 to that most remarkable discovery of PithecantJiropus erectus, have 

 laid the Zoological world under a most weighty obligation ; and, 

 that the aforesaid members of the Fourth International Congress 

 of Zoology hereby desire to express the fervent hope that these 

 investigations may be continued in the future with the same 

 thoroughness as in the past." 



