But as impressions of plants are rare in these shales, which contain ammonites, oysters, and other marine shells, the bitumen may perhaps be of animal origin.
It is doubtless of animal origin, and partly coprolitic, probably derived from the excrement of fish.
Now it had been often suspected, before these discoveries, that white chalk might be of animal origin, even where every trace of organic structure has vanished.
But all fossil oil is probably of vegetable or animal origin, from masses of vegetables or animals long buried in the earth.
Besides the phosphoric, there are other acids of an animal origin; as that of milk, that of sugar of milk, that of the animal calculus, and that of fat.
In most foods, especially in those of animal origin, nitrogen occurs in chemical combination.
All natural food products, whether of vegetable or animal origin, contain a limited but ever-present amount of mineral salts.
Substances which correspond in composition to both these types are found in plant tissues and the same class names are applied in a general way to lipoids of either plant or animal origin.
Plant lipoids have not been studied to nearly the same extent as have those which occur in the animal body; and certain observers believe that there are significant differences between the lipoids of plants and those of animal origin.
In the previous articles we have only spoken of the odors of plants; we now enter upon those materials used in perfumery of an animal origin.
On terminating our remarks relating to the simple preparations of the odors of plants, and before we speak of perfumes of an animal origin, or of those compound odors sold as bouquets, nosegays, &c.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "animal origin" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.
