78 SECTIONAL ADDRESSES 
assuming that acquired characters are inherited. ‘The inheritance of 
acquired characters must also depend upon the ultimate effect upon the 
germ-cell-chromosomes of changes in habit, physiological activity and in 
structure in individuals, so that the only centre which can be responsible 
for the origin of new species is the one which is responsible for maintaining 
orthodoxy and the chief struggle for existence seems to be in the chromo- 
somes, which are perpetually endeavouring to maintain their normal 
constitution and relationship against agencies endeavouring to change 
them. 
