...To-day we realize that there are no hard andfast racial types among men... 
W.E.B. Du Bois 「The Negro」
...The mistake is continually made of consideringthese types as transitions between absolute Caucasians and absoluteNegroes...
W.E.B. Du Bois 「The Negro」
...Such men—and there were others—ought not to be forgottenor confounded with other types of colored and white Reconstructionleaders...
W.E.B. Du Bois 「The Negro」
...The largest collection of toothedbirds, including the types of Hesperornis, Ichthyornisand others, is in the Yale University Museum, at NewHaven...
Frederic A. Lucas 「Animals of the Past」
...They are relics of an earlierera which have come down to us as types of conditionsthat once existed very generally...
Clarence M. Weed 「Butterflies Worth Knowing」
...The various types and varieties may be briefly described...
Worrallo Whitney 「A Guide for the Study of Animals」
...Other Types of Brooder Houses...
Harry M. Lamon 「Ducks and Geese」
...Four distinct types of locomotion have been described in snakes: horizontal undulatory, rectilinear, sidewinding, and concertina (Klauber, 1956: 331-350)...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...The other two types of locomotion, sidewinding and concertina, have not, to my knowledge, been observed in the cottonmouth...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...It was at first believed that there were two types of venoms: neurotoxic, which acts upon nervous tissue; and haemotoxic, which acts on blood and other tissues...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...On this subject I will only say that there are three principal types of tongues—a short bifid tongue (fig...
Edward Saunders 「Wild Bees, Wasps and Ants」
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