...In brief, it is the substratum of materialsthroughout the universe, between planets, stars and the galaxies... 
Various 「Astounding Stories, August, 1931」
...It is not, however, as important as othermatters, such as the condition of the food substratum or sensitivityof the pituitary-gonadal mechanism, in determining timing and mode ofbreeding activity...
Richard F. Johnston 「The Breeding Birds of Kansas」
...Its color corresponds to that of the substratum where the species forages...
Glen E. Woolfenden 「Comparative Breeding Behavior of Ammospiza caudacuta and A. maritima」
...He has marshalled his data with great skill, and has dissected out, as it were, the physical and cultural elementsof the Negrito substratum...
Robert W. Williamson 「The Mafulu」
...Precise and lucid, itsummarises our knowledge of the substance which fills all space andpenetrates all matter—the substratum of matter itself...
E. Walter Maunder 「Are the Planets Inhabited?」
...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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