...We saw a smaller kind of the same tree, named Molondo, the fruit of which is about the size of marbles, having a tender skin, and slight acidity of taste mingled with its sweetness... 
David Livingstone 「Missionary Travels and Researches in South Africa」
...Among other causes oftenmentioned are acidity of the blood, nervous derangement, microbes, andinjuries...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
... The Wasps' possess only the acid element; and it is to this very acidity and not to the 'so-called' skill of the operators that the preservation of the provisions is due...
J. Henri Fabre 「Bramble-bees and Others」
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