86 EXPLOITATION OF PLANTS 
hairs as raw material for industrial purposes ; but it 
must be understood that these divisions are convenient 
mental abstractions, not water-tight compartments, 
and that they break down and intercommunicate in 
sound research practice; obviously, cotton should be 
grown to meet the needs of the consumer, and the 
consumer is limited by the capabilities of the plant. 
For all practical purposes we may regard the second 
division as an untouched field for serious modern 
research, while the first has only been pioneered suffi- 
ciently to indicate its possibilities. The various sub- 
jects available for study, and their general interrelation, 
are indicated in the following table, which, in its present 
form, needs a little amplification. 
.The task before the Grower is to grow the right thing ; 
firstly, in sufficient quantity to pay him adequately for 
the land and labour employed; thus his concern is 
primarily with Yield. Since the financial return is not 
dependent on yield alone, but on the product of yield 
by price, he is also concerned with Quality ; whether 
such quality be due to inherited properties of the 
variety grown, or to the effects of cultivation, or to both 
causes. The conduct of the Grower’s work in regard 
to the yield obtained from a given variety is a form of 
Applied Plant Physiology ; so also'in the matter of the 
quality of cotton obtained from the same variety; in 
the choice of the variety grown he is implicated at 
more or less distance in researches on the isolation of 
pure strains, and the working of Mendel’s Law in 
hybrids. 
The job before the Spinner—allowing him to typify 
the consumers of cotton—is to arrange the tangled 
