The function of the calciferous glands of earthworms.

摘要: 1. In the Lumbricidae secretion of calciferous glands consists mainly calcium carbonate, percentage carbonate in calcite concretions being 95-97 per cent. 2. Feeding experiments indicate that can be derived from common inorganic salts such as sulphate, phosphate, oxalate, chloride, and nitrate, also pear leaves. 3. Measurements hydrogen-ion concentration gut, soil, castings specimens Lumbricus terrestris show tendency cast to more neutral than soil is due secretions gut a whole, not glands. 4. The optimum p H9s two main intestinal enzymes have been measured. Amylase has an at H 6·8-7·0, lipase 6·4-6·6 7·3-7·7 depending on substrate. 5. amount carbon dioxide bound by was measured series with earthworms kept different salts. excreted never exceeded 10 cent, total metabolic dioxide. 6. Absorption iron saccharate injected into worms took place occasionally, groups adjacent cells intestine isolated 7. true function excretion, passed crystals which are chemically inactive gut.