6DEVELOPMENT OF THE FLORAL ORGANS OF SWEET CLOVER.
24RELATION OF THE POSITION OF THE FLOWERS ON MELILOTUS ALBA PLANTS TO SEED PRODUCTION.
7DEVELOPMENT OF THE OVULES.
25INFLUENCE OF THE WEATHER AT BLOSSOMING TIME UPON SEED PRODUCTION.
8STERILITY OF THE OVULES.
26INSECT POLLINATORS OF SWEET CLOVER.
9DEVELOPMENT OF THE POLLEN.
27EFFECT OF MOISTURE UPON THE PRODUCTION OF MELILOTUS ALBA SEED.
10FERTILIZATION IN MELILOTUS ALBA.
28Part II.—STRUCTURE AND CHEMICAL NATURE OF THE SEED COAT AND ITS RELATION TO IMPERMEABLE SEEDS OF SWEET CLOVER.[3]
11DEVELOPMENT OF THE SEED.
29HISTORICAL SUMMARY.
12MATURE POLLEN OF SWEET CLOVER.
30MATERIAL AND METHODS.
13GERMINATION OF THE POLLEN.
31STRUCTURE OF THE SEED COAT.
14CROSS-POLLINATION AND SELF-POLLINATION OF SWEET CLOVER.
32MICROCHEMISTRY OF THE SEED COAT.
15ARTIFICIAL MANIPULATION OF SWEET-CLOVER FLOWERS.[2]
33THE SEED COAT IN RELATION TO THE ABSORPTION OF WATER.
16SEED PRODUCTION OF MELILOTUS ALBA UNDER ORDINARY FIELD CONDITIONS.
34A COMPARISON OF PERMEABLE AND IMPERMEABLE SEED COATS.
17EFFICIENCY OF CERTAIN KINDS OF INSECTS AS POLLINATORS OF SWEET CLOVER.
35THE ACTION OF SULPHURIC ACID ON THE COATS OF IMPERMEABLE SEEDS.
18PLANTS SUBJECT TO INSECT VISITATION AT ALL TIMES.
36LITERATURE CITED.
