...Immunogenetic studies of species and of species hybrids in doves, and the separation of species-specific substances in the backcross... 
William B. Stallcup 「Myology and Serology of the Avian Family Fringillidae」
...caffra; he has seen a pair of hybrids which were quite tame and particularly attached to the lady who brought them up; and Mr...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...Sonneratii, bankiva, and varius, only 12 chickens were reared, and of these only three were the product of hybrids inter se...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
... First, that the parent-trees have been in every case hybrids between the peach and nectarine, and have reverted by bud-variation or by seed to one of their pure parent-forms...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...stramonium; and three of these hybrids produced many capsules, of which a half, or quarter, or lesser segment was smooth and of small size like the capsule of the pure D...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...With respect to the extraordinary tendency which this tree exhibits to complete or partial reversion, we have seen that undoubted seminal hybrids and mongrels are similarly liable...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...34), who says the hybrids were very fertile...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...235) state that the hybrids from these two turtle-doves are invariably sterile both inter se and with either pure parent...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...Two of the latter male hybrids paired with their pure parents, viz...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...At Paris, hybrids have been raised (Isid...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...In domestication individuals ofdistinct yet similar species are sometimes mated and produce offspringcalled hybrids, but these are sterile...
John H. Robinson 「Our Domestic Birds」
...Among other domestic birds hybrids are almostunknown...
John H. Robinson 「Our Domestic Birds」
...Streams from which we report hybrids probably were affectedby overgrazing of their watersheds; overgrazing was unusuallysevere in the drought...
Frank B. Cross 「Five Natural Hybrid Combinations in Minnows (Cyprinidae)」
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