. Towards racial health : a handbook on the training of boys and girls, parents, teachers & social workers. 152 THE BIOLOGY OF SEX large eggs. This is a valuable illustration, aid sufficientlyremote from man to be explicit without being stimula-tive. Cyclops, another minute crustacean, is not com-pressed laterally; its body is more definitely segmented,and the mature female carries eggs in two egg-sacs. A Water- Flea (Daphnia) (enlarged). Showing eggs within the brood-chamber under the this species, which may be ^ of an inch long, the eggs areplainly visible with a hand lens in Jan
. Towards racial health : a handbook on the training of boys and girls, parents, teachers & social workers. 152 THE BIOLOGY OF SEX large eggs. This is a valuable illustration, aid sufficientlyremote from man to be explicit without being stimula-tive. Cyclops, another minute crustacean, is not com-pressed laterally; its body is more definitely segmented,and the mature female carries eggs in two egg-sacs. A Water- Flea (Daphnia) (enlarged). Showing eggs within the brood-chamber under the this species, which may be ^ of an inch long, the eggs areplainly visible with a hand lens in January and February. attached to the abdomen: here the eggs are carriedtill they hatch. Plant life forms many opportunities of dealing withphysiologic and reproductive questions which willhelp towards the accomplishment of our aim in sexeducation, and particularly one may refer to howthe study of the fertilisation process in plants may leadnaturally to a knowledge of what hybridisation means, THE BIOLOGY OF SEX 153 An acquaintance with Mendels work in connection withplant hybridisation should follow. Gregor Mendel, born in 1822, was an Austrian monkwho performed, in connection with plant hybridisation,certain experiments, and who drew from the results of
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