CHAPTER IV. 
THE CO-ORDINATED TARTS AND THE CORRELATED 
VARIATIONS OF ORGANIC STRUCTURES. 
“The whole body fitly joined together and compacted by that 
which every joint supplieth, according to the effectual working in the 
measure of every part, maketh increase of the body unto the edifying 
(building up) of itself.” 
“ For let our finger ache, and it endues 
Our other healthful members ev’n to that sense 
Of pain.”—Othello. Act m., sc. 4. 
“ When one part is modified . . . other parts of the organi 
sation will be unavoidably modified.”—Darwin. 
Before we proceed to compare the effect of Natural 
Selection with that of other influences in bringing about 
a transmutation of a specific type, we have first to enquire 
whether there is anything in the very nature of the 
organism itself which will co-operate in producing such 
a result. There can be little doubt that there is such a 
principle at work. In every organism the different parts 
are co-ordinated to one another. The symmetry of the 
whole is secured by the proportionate relation which 
exists between the parts. The efficiency of the whole as 
an apparatus to perform a given work is the result of 
the functional activity of the parts and their co-operation