Sentence:  Also , interlobular air drifts may be all but nonexistent in the cow ; probably occur in the horse much as in the human being ; and , in contrast are present to a relatively immense degree on a segmental <WSD>basis</WSD> in the dog where lobules are absent ( Van Allen and Lindskog , ' 31 ) . 
Meaning of the word marked with <WSD> tags:  the fundamental assumptions from which something is begun or developed or calculated or explained