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Adventures with animals and plants. Biology. Frog Fig. 370 (above) Sperm cells froi// five kinds of anmials. In ivhat respect do these five sperm cells reseinble each other? Fig. 371 (right)
The first principles of heredity; with 75 illustrations and diagrms . hat the sperm-nucleuscan be dispensed with appears from some experiments ofProfessor Loeb. He induced ova of the sea-urchin Arhaciato develop parthenogenetically—i.e.,