88 ORGANISM AND ENVIRONMENT 
nomena have no prospect but to remain seeking indefi- 
nitely, unless they cut the knot by relapsing into vital- 
ism. 
But is there no scientific clue through this apparent 
maze? Does not the element of regulation which, as 
we have seen throughout, is the outstanding feature 
of biological phenomena, furnish the clue? In the 
next lecture this question will be discussed. 
