...Fourfamilies—1st, Hornless Ruminants, Camels, Musks; 2nd, Cervidæ,true horns shed periodically, Deer; 3rd, Persistent horns,Giraffes; 4th, Hollow-horned Ruminants, Antelopes, Goats, Sheepand Oxen... 
Robert A. Sterndale 「Natural History of the Mammalia of India and Ceylon」
...This should be resortedto periodically, in order to secure the best results...
Robert Jennings 「Sheep, Swine, and Poultry」
...The species occupies marginal habitat inmost of Kansas and periodically is reduced in numbers by severewinters...
Richard F. Johnston 「The Breeding Birds of Kansas」
...Individuals snapped or lunged periodically at objects on the groundalong the route of travel...
John M. Legler 「Natural History of the Ornate Box Turtle, Terrapene ornata ornata Agassiz」
...The area has been periodically subjected to droughts and floods...
Artie L. Metcalf 「Fishes of Chautauqua, Cowley and Elk Counties, Kansas」
...According to a Chinese philosopher, the reason for thus renewingfire periodically is that the vital principle grows weaker andweaker in old fire, whereas in new fire it is young and vigorous...
Sir James George Frazer 「Balder The Beautiful, Vol. I.」
...The result ofthis close approach is that periodically one pulls the other on andis itself pulled back; but since the three points progress, it isnot always the same planet which gets pulled back...
Oliver Lodge 「Pioneers of Science」
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