112 
necrotic areas would produce a corresponding tissue reaction, 
and so the tumour would continue to enlarge or grow. 
The chronicity of the tumour is due mainly to three 
factors, whilst in some cases there is a fourth. In the first 
place the slow diffusion of the necrosis;producing substance, 
i í : ing in 
tinctly observed in tumours examined from cases occurring 
d 
ere se no doubt that the presence o cn 
larvae in the subepithelial tissues is accidental. qs ar hd 
apparently have no power of completing their life-history, Í 
even in 
anyth 
granular débris. 
However, soon after their introduction the larvae must 
arva cannot correctly be called a parasite, des 
parasite may be defined as a living organism which takes 
its abode on or within other living organisms for the p 
REL eem cep arama m cU EE 
. ( That absorption of dead tissue depends mainly upon ‘hf 
dala or incompleteness of the destruction of bus M 
,.r enzymes is illustrated by the following experi 
$t resh normal tissue, one heated to 100° C., a : 
red, when placed in the abdominal cavity of the same 
i ve iffe changes. The unheated tissue soon unde : 
and is absorbed, whereas the heat Rr e 
eS no autolytic changes, and is very 
