CHAPTER XXYII. 
VARIATION BY USE AND DISUSE. 
“ In the sweat of thy face shalt thou eat bread.” Nature owes 
no man a living: he must earn it. 
“ God did anoint thee witli his odorous oil, 
To wrestle, not to reign.” 
Look where we may, we see man at labor—in the 
field, in the factory, in the trench, and in the office. 
From morning till night, and from week to week, 
the merchant plans how to keep abreast of his com¬ 
petitors. The masses of our great cities repeat their 
tasks with every rolling snn, and they wdio have no 
tasks struggle to find one. Struggle brings exer¬ 
cise of body and mind, and with it come health and 
strength and thrift. 
“ Labor is life ! ’tis the still water faileth; 
Idleness ever despaireth, bewaileth ; 
Keep the watch wound, or the dark rust assaileth.” 
At first it may not appear to ns that plants and 
animals, like men, must struggle for a living. A little 
observation will soon convince ns that this is a fact. 
Professor Bailey gives the results of his study of a 
cherry-tree which came up near his door. The first 
year it grew 19 inches and bore 27 buds, and a branch 
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