Part Ii.--Structure and Chemical Nature of the Seed Coat

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