No. G30] HUMAN MORTALITY RATES 



39 



made up in the same way as Table XII except that in the 

 former items 64 and 65 are transferred from ectoderm to 

 mesoderm. So far as I have been able to think the mat- 

 ter through it does not appear that the same complica- 

 tion may fairly be considered to arise in connection with 

 the embryological assignment of any other " cause of 

 death. ' ' 



TABLE XII 



Showing the Relative Influence of the Primary Germ Layers in 



C. Endoderm.— The process of getting the figures here 

 was to add together first the totals of Tables II and VI 

 (respiratory system and alimentary tract) the organs 

 represented being mainly endodermal in origin. Then 

 there were subtracted from this total the following: (a) 

 items 39 (cancer of the buccal cavity) and 0.34 of item 41 

 (cancer of the. peritoneum, intestines, and rectum), leav- 

 ing 0.66 of this latter item here for cancer of intestines ; 

 (b) items 117 (simple peritonitis) and 93 (pleurisy) ; (c) 

 item 86 (diseases of the nasal fossa?). All of these items 

 subtracted have been already placed with either ectoderm 

 or mesoderm. Finally, there were added items 124 and 

 125 (diseases of the bladder and of the urethra) which 

 were taken from the mesoderm for reasons already stated 

 under that heading. Also there were added items 51 and 

 88 from Table IX (exophthalmic goiter and diseases of 

 the thyroid body), because the thyroid arises from the 

 epithelium lining the inner branchial furrows. The re- 



