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Volume I — By Chapters 
ee a BS, oo * Page 3 
How the Cactus Got Its Spines — 
And How It Lost Them 
—A Sidelight on 
The Importance of Environment .....,....... : 
Twenty-three Potato Seeds — 
And What They Taught 
—A Glim at th 
Infinente of Heredity Sama Netaviel ¢ Mase fo'.é hidhte "e 35 
No Two Living Things 
Exactly Alike 
—Infinite Ingenuity the Price 
Of Variation. ssa ce ee tc tc ce tense 67 
The Rivalry of Plants 
To Please Us 
—On the Forward March of 
Adaptation ..-.-2- 22+ ee eee eraeceesvee 107 
Let Us Now Produce a 
New Pink Daisy 
—A Practical Lesson in 
Harnessing Heredity... 65.222 sececccssce 141 
Short-Cuts Into the 
Centuries to Come 
—Better Plants Secured by 77 
Hurrying Evolution ....-.222++eeeeeeees ( 
How Far Can Plant 
Improvement Go ? 
—The Crossroads Where Fact 9 1 1 
and Theory Seem to Part .....-2-+-++ss+e+s00- 
Some Plants Which Are Begging 
for Immediate Improvement 
Page risniaisie RMMOG Nye aston 3 3 245 
Piecing the Fragments of a 
Motion Picture Film 
—We Stop to Take ¢ 
At Backward GGlAanee iso. o's (654 10) aw! 2 tniie et Shi 0.8 275 
List of Direct Color Photograph Prints ..... 305 
