...for they portray the most human hurt of the Twentieth Cycle of that poorJesus who was called the Christ!... 
W. E. B. Du Bois 「Darkwater」
...One-half the cycle (from replacement on one side to replacement on the other) varied from five to twenty days, indicating that the cycles for each fang are independent of one another...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...One cottonmouth was examined periodically over a 34-day period by Allen and Swindell (1948:12), but a complete fang-shedding cycle was not observed...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...Fitch (1956:463) found that copperheads in northeastern Kansas begin their annual cycle of activity in the latter part of April, when the daily maximum temperature is about 22° C...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...Indications are that in the northern part of its range the annual activity cycle of the cottonmouth resembles that of the copperhead in northeastern Kansas...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
... At times in the fang-shedding cycle three and even four fangs can be in operation simultaneously...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
... Since about half the adult females were fecund, it was concluded that a biennial reproductive cycle occurs in this species...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...An annual cycle may occur in areas where temperature permits year-round activity...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...The reproductive cycle of the prairie rattler...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...Many persons have contributed field observations such as dates ofarrival and departure for migrants, and the various activities of thebreeding cycle for most of the species here discussed...
Richard F. Johnston 「The Breeding Birds of Kansas」
...The yearly cycle of the common Aphids of the apple tree has been latelyworked out in detail by and ...
Geo. H. Carpenter 「The Life-Story of Insects」
...For such a distinct and regular feature in the life cycle of thespecies as the retrograde autumnal movement there must be somebiological explanation...
Francis Harper 「The Barren Ground Caribou of Keewatin」
...In most instances theorifice was not indicative of actual oestrus, as it persisted throughthe preceding and following stages of an oestrus cycle...
Henry S. Fitch 「Ecological Observations on the Woodrat, Neotoma floridana」
...A correspondent, writing to me from one of thecolleges, suggests that our spring really begins inDecember, because the "annual cycle of vegetablelife" seems to start then...
John Burroughs 「Ways of Nature」
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