and its Relation to Impermeable Seeds of Sweet Clover.
Historical summary 26
Material and methods 30
Structure of the seed coat 31
Microchemistry of the seed coat 33
The seed coat in relation to the absorption of water 34
A comparison of permeable and impermeable seed coats 34
The action of sulphuric acid on the coats of impermeable seeds 35
Literature Cited 36
[Illustration]
WASHINGTON GOVERNMENT PRINTING OFFICE
1920
UNITED STATES DEPARTMENT OF AGRICULTURE
BULLETIN No. 844
Contribution from the Bureau of Plant Industry
WM. A. TAYLOR, Chief
Washington, D. C. PROFESSIONAL PAPER August 11, 1920
SWEET-CLOVER SEED