...This reminds us of the changing colours, green, red and milky white, to which the Nile and all great African rivers that flood periodically are subject... 
Richard F. Burton 「Two Trips to Gorilla Land and the Cataracts of the Congo Volume 2」
...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」
...The infected area as now determined is shown in mapsissued periodically...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...The species occupies marginal habitat inmost of Kansas and periodically is reduced in numbers by severewinters...
Richard F. Johnston 「The Breeding Birds of Kansas」
...It follows,therefore, that at least during the period through which the insectcontinues to grow, the cuticle must be periodically shed...
Geo. H. Carpenter 「The Life-Story of Insects」
...In species that periodically shed scutes a zone of fracture developsbetween the old and new layers of the scute as each newlayer of epidermis is formed, and the old layer is shed...
John M. Legler 「Natural History of the Ornate Box Turtle, Terrapene ornata ornata Agassiz」
...In the area censused, much additional fishing isdone with set-lines, that are checked periodically by the owners...
W. L. Minckley 「Fishes of the Big Blue River Basin, Kansas」
...The area has been periodically subjected to droughts and floods...
Artie L. Metcalf 「Fishes of Chautauqua, Cowley and Elk Counties, Kansas」
...The handle-shaped appearance which theobject periodically assumed demonstrated that the ring could not beattached to the globe...
Robert Stawell Ball 「The Story of the Heavens」
...Those lines whichare common to the two spectra will therefore periodically become double...
Robert Stawell Ball 「The Story of the Heavens」
...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」
...The great Newton announced that, like theplanets, they were obedient to universal attraction; that they mustfollow an extremely elongated curve, and return periodically to thefocus of the ellipse...
Camille Flammarion Frances A. Welby 「Astronomy for Amateurs」
... Sometimes it happens that a star's radial movement is periodically reversed; first it approaches, and then it recedes...
Garrett Serviss 「Curiosities of the Sky」
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defecate cannonball Neville
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