Sentence:  The weaknesses or disorder of the bowels seem chiefly to be occasioned by the poor, watery, meagre, vegetable diet of the children and of their mothers. The latter, from the use of this diet, have their milk poor, and not sufficiently <WSD>animalised</WSD>. 
Meaning of the word marked with <WSD> tags:  To convert or produce material rich in animal substance.