Sentence:  ... the tallest horses and oxen are between four and five inches in height, the sheep an inch and half, more or less: their geese about the <WSD>bigness</WSD> of a sparrow, and so the several gradations downwards till you come to the smallest, which to my sight, were almost invisible ... 
Meaning of the word marked with <WSD> tags:  Size. (from 15th c.)