...The outer part is a thincoating of loose threads: the inner is tough paper, impervious web, justlike that which forms the wasps' hive, but stronger... 
David Livingstone 「The Last Journals of David Livingstone, in Central Africa, from 1865 to His Death, Volume II (of 2), 1869-1873」
...These present an airy, cool, and light appearance, highly suitable to a tropical region, and yet are impervious to rain...
Horatio Bridge 「Journal of an African Cruiser」
...Add to this thethickness of the skin itself, and the combination forms a covering thatis almost impervious to cold...
William T. Hornaday 「The Extermination of the American Bison」
...The sugar-cane is his great delight, bothas being his favourite food and as affording a high, impervious, andunfrequented situation...
Robert A. Sterndale 「Natural History of the Mammalia of India and Ceylon」
... the effect of the acid on him would be to change and harden his flesh and make it impervious to decay or change of any ...
W. H. Hudson 「Birds in Town and Village」
...The slight bodies of the Xoranians seemed as impervious to bullets and missiles as though armor-plated...
Various 「Astounding Stories of Super-Science January 1931」
...Thehard outer rind seemed to be impervious to the explosions...
Arthur J. Burks 「Lords of the Stratosphere」
...That this opinion comes neerer to the truth thanthat common one of Aristotle which hath to no purpose filled theheavens with such reall and impervious Orbes...
John Wilkins 「The Discovery of a World in the Moone」
...The water is no doubt permanent, forit is supplied by the drainage of the sandhills that surround it, and itrests on a substratum of impervious clay...
Ernest Giles 「Australia Twice Traversed, The Romance of Exploration」
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