. American journal of physiology. hydrolyze fats and car-bohydrates, viz., a lipase, an amylase,and an invertin. No proteolytic activ-ity could be detected. The intestine extends from the pyloricsphincter to the anal papilla in themantle cavity. It is a thin walled tubeof simple epithelium, surrounded by asheath of vascular connective may go on here, but only toa limited extent, since the digestive re-sidues are retained in the stomach untilthe absorption there is complete, where-upon the contraction of the muscularcoat of the stomach, and the opening ofthe sphincter allow th
. American journal of physiology. hydrolyze fats and car-bohydrates, viz., a lipase, an amylase,and an invertin. No proteolytic activ-ity could be detected. The intestine extends from the pyloricsphincter to the anal papilla in themantle cavity. It is a thin walled tubeof simple epithelium, surrounded by asheath of vascular connective may go on here, but only toa limited extent, since the digestive re-sidues are retained in the stomach untilthe absorption there is complete, where-upon the contraction of the muscularcoat of the stomach, and the opening ofthe sphincter allow the entire mass tobe evacuated. No typical digestive enzymes were discovered in theintestinal wall. Digestion experiments,— In carrying out the digestion experimentsupon which the preceding conclusions are based, every attempt vifasmade to exclude as far as possible the influence of disturbing factors,such as putrefaction, bacterial contamination, etc. Control trialswere conducted in each case with boiled portions of the various. t. Figure 7. — Section of the tip ofone of the rugae more highlymagnified, showing the mech-anism for rapid , epithelium; s., sinus; b. v.,blood-vessel; r. c. t., vascularconnective tissue. 1 It is of interest in this connection to note further, that while glycogen isfound in abundance in the muscles of this animal, and is undoubtedly the form inwhich part of the carbohydrate of the food is ingested, none could be obtainedfrom the liver. Dextrose and fats are, however, always present in abundance. 2 H. C. Bradley: Science, n. s. 1904, xix, p. 196. Experimental Studies on the Physiology of Molluscs. 23 glandular extracts used; and where doubtful results were obtained,the experiments were repeated. The extracts were made with theorgans removed from the living specimens. The usual procedurewas to grind the gland with fine sand and extract with a 2 per centsodium fluoride solution, or in some cases with chloroform-wateror glycerin, and
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