...It is the southern and lowest part of the great river system beyond, in which large tracts of country are inundated annually by tropical rains, hereafter to be described... 
David Livingstone 「Missionary Travels and Researches in South Africa」
...The soil, however, is equal to the production of any tropical plant or fruit...
David Livingstone 「Missionary Travels and Researches in South Africa」
... "The climate here is much cooler than nearer the sea, and Asevedo has successfully cultivated most European as well as tropical vegetables...
David Livingstone 「Missionary Travels and Researches in South Africa」
...We regret to have to omit the travels and wonderful adventures of Du Chaillu through the gorilla country and other portions of tropical Africa...
W.H.G. Kingston 「Great African Travellers」
...Certainly sleep descending on the tropical traveller is armed with a bludgeon...
Stewart Edward White 「African Camp Fires」
...For the first time, too, we began to experience what our preconceptions had imagined as tropical heat...
Stewart Edward White 「African Camp Fires」
...The gray dawn comes, and shortly, in the sudden tropical fashion, the full light...
Stewart Edward White 「African Camp Fires」
...About eight o'clock, the evening of our first day on the Swanee, the heat broke in a tropical downpour...
Stewart Edward White 「African Camp Fires」
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