...The travellers, having now entered the tropics, expected to reach pleasanter regions than they had hitherto passed through... 
W.H.G. Kingston 「Great African Travellers」
...With every foot of new ground he travelled over he forged a chain of sympathy which should hereafter bind the Christian nations in bonds of love and charity to the heathen of the African tropics...
W.H.G. Kingston 「Great African Travellers」
..."The rainy season of a place within the tropics always begins when the sun has reached the zenith of that place...
Richard F. Burton 「Two Trips to Gorilla Land and the Cataracts of the Congo Volume 1」
...This has been my plan in the tropics from the beginning, when it was suggested to me by the simplest exercise of the reasoning faculties...
Richard F. Burton 「Two Trips to Gorilla Land and the Cataracts of the Congo Volume 1」
...A similarobservation applies to bats, which are dormant during a northernwinter when insects are rare, but never become torpid in any partof the tropics...
J. Emerson Tennent 「Sketches of the Natural History of Ceylon」
...The Blue Swallowtail is said to have closer affinity withthe splendid butterflies of the tropics than most of ourother Papilios...
Clarence M. Weed 「Butterflies Worth Knowing」
...Even in the tropics and other warm regions, where bright green, blue or coppery coloured species occur, they are comparatively few in number...
Edward Saunders 「Wild Bees, Wasps and Ants」
...Eastern North America; nesting from Florida toCanada; winters in the tropics...
Frank M. Chapman 「What Bird is That?」
...Nests from northern Georgia and southern Kansas toCanada; winters in the tropics...
Frank M. Chapman 「What Bird is That?」
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