etiaractcristic of the physiological age of the larvae 

 (Payne, 1923; Cort, 1925). A decrease in the amount of fat 

 granules was also observed by Giovannola (1936) in the filari- 

 form larvae of several species, especially 'f" f'^J' were kept at 

 37° C. 



It seems, however, that these larvae also consume glycogen. 

 Giovannola (1936) found small amounts of glycogen in young 

 rhabditiform larvae of Necator, Anci/lostoma and Nippostrongy- 

 lus, but none in the filariform stages. A comparable observa- 

 tion was made by Stepanow-Grigoricw and Hoeppli (1936) who 

 found glycogen in one- or two-day old filariform larvae of 

 Strongyloidcs, but never in three- to nine-day old larvae. 



Bibliography 



ENVIRONMENT AND ITS INFLUENCE ON 

 METABOLISM 



Andre\vs, J. S. 1938. — Effect of infestation with the nematode 

 Coopcria curticei on the nutrition of lambs. J. Agric. Res., 

 V. 57:349-360. 



Arnold, L. 1933. — The bacterial flora within the stomach and 

 small intestine. The effect of experimental alterations of 

 acid base balance and of the age of the subject. Am. J. 

 Med. Sc, V. 186:471-480. 



ASHCRATT, D. W. 1933. — Effect of milk products on pH of the 

 intestinal contents of domestic fowl. Poultry Sc, v. 12:292- 

 298. 



Ball, B. H. 1939. — The pH ef the digestive tract in the living 

 albino rat as determined by the capillary glass electrode. 

 Am. J. Physiol., v. 128:175-178. 



Balls, A. K. and Swenson, T. L. 1934. — The antitrypsin of 

 egg white. J. Biol. Chem., v. 106:409-419. 



Bascth, S. 1908. — The stomach and intestinal gases. N. Y. Med. 

 J., V. 88:684-689, 738-741. 



Bergeim, O. 1924. — Intestinal chemistry. I. The estimation 

 of intestinal reductions. II. Intestinal reductions as mea- 

 sures of intestinal putrefaction, with some observations on 

 the influence of diet. J. Biol. Chem., v. 62:45-60. 



VON BONSDORFF, B. 1939. — Influence of intestinal worms on 

 proteolytic activity in vitro of trypsin, papain, and pepsin 

 and human gastric juice at neutral reaction. Acta. Med. 

 Seand., v. 100:459-482. 



VON Brand, T. 1934. — Das Leben ohne Sauerstoff bei wirbcUo- 

 sen Tieren. Ergeb. Biol., v. 10:37-100. 



1938. — The nature of the metabolic activities of intes- 

 tinal helminths in their natural habitat : aerobiosis or an- 

 aerobiosis? Biodynamica (41), 13 pp. 



VON Brand, T. and Weise, W. 1932. — Beobachtungen iiber den 

 Sauerstoff gehalt der Umwelt einiger Entoparasiten. Ztschr. 

 Vergleieh. Physiol., v. 18:339-346. 



Collier, H. B. 1941. — A trypsin inhibiting fraction of Ascaris 

 Canad. J. Res., v. 19B : 90-98. 



Danniger, R., Pfragner, K. and Schultes, H. 1928. — Uber 

 die absolute Reaktion in dem Inhalt der einzelnen Darm 

 abschnitte von Pferd und Rind. PflUger's Arch., v. 220: 

 430-433. 



Dastre, A. and Stassano, H. 1903. — Existence d'une Antiki- 

 nase chez les parasites intestinaux. Comp. Rend. Soe. Biol. 

 Paris, V. .55:131-132. 



Davey, D. G. 1936. — Notes on the osmotic jircssure of the con- 

 tents of the stomach compartments of the sheep. J. Agric. 

 Sc, V. 26:328-330. 



1938. — Studies on the physiology of the nematodes of 

 the alimentary canal of sheep. Parasit., v. 30:278-295. 



Eastman, I. M. and Miller, E. G., Jr. 1935. — Gastrointesti- 

 nal pH in rats as determined by the glass electrode. J. 

 Biol. Chem., v. 110:2.55-262. 



Eldin, M. S. and Hassan, A. 1933. — Gastric functions in 

 helminthic infections. J. Egypt. Med. Assoc, v. 16:735-752. 

 [Abstract] Trop. Dis. Bull., 1934, v. 31:767. 



Enigk, C. 1936. — Untersuchungen Uber die Abtiitung der Spul- 

 wurmeier und Coccidienooeysten durch Chemikalien. Arch. 

 Wiss. Prakt. Tierheilk. v. 70:439-448. 



Ferber, K. E. 1928. — Die Zahl und Masse der Infusorien im 

 Pansen und ihre Bedeutung fiir den Eiweissaufbau beim 

 Wiederkiiuer. Ztschr. Tierziicht. & Ziichtungsbiol., v. 12; 

 31-63. 



Fernandez, F. 1934. — Parasitismo intestinal y jugo gastrico. 

 Med. Paises C:'ilidos, Madrid, v. 7:336-338. [Abstract] 

 Trop. Dis. Bull., 1934, v. 31:767. 



Fries, J. A. 1906. — Intestinal gases of man. Am. J. Physiol., 

 V. 16:468-474. 



Frost, W. D. and Hankinson, H. 1931. — Lactobacillus aci- 

 dophilus, an annotated bibliography to 1931. Milton, Wis. 



Glaser, R. W. and Stoll, N. R. 1938. — Development under 

 sterile conditions of the sheep stomach worm Haemoiwhus 

 contortus (Nematode). Science, v. 87:259-260. 



Graham, W. R. and Emery, E. S. 1927-28. — The reaction of 

 the intestinal contents of dogs fed on different diets. J. 

 Lab. & Clin. Med., v. 13:1097-1108. 



Grayzbl, D. M. and Miller, E. G., Jr. 1928.— The pH of the 

 contents of the gastrointestinal tract in dogs, in relation 

 to diet and rickets. J. Biol. Chem., v. 76:423-436. 



Grove, E. W., Olmsteid, W. H. and Koeniq, K. 1929.— The 

 effect of diet and catharsis on the lower volatile fatty 

 acids in the stools of normal men. .J. Biol. Chem., v. 85: 

 127-136. 



Hamill, J. M. 1906. — On the mechanism of protection of in- 

 testinal worms, and its bearing on the relation of entero- 

 kinase to trypsin. J. Physiol., v. 33:479-492. 



Habned, B. K. and Nash, T. P., Jr. 1932. — The protection of 

 insulin by antiproteases, and its absorption from the intes- 

 tine. J. Biol. Chem., v. 97:443-456. 



Heller, V. G., Owens, J. R. and Portwood, L. 1935. — The 

 effect of the ingestion of saline waters upon the pH of the 

 intestinal tract, the nitrogen balance and the coefficient 

 of digestibility. J. Nutrition, v. 10:645-651. 



Herrin, R. C. 1937. — Ammonia content, pH, and carbon diox- 

 ide tension in the intestine of dogs. J. Biol. Chem., v. 

 118:459-470. 



Hbupke, W. 1931. — Uber die Sekretion und Excretion des 

 Dickdarms. Ztschr. Gesam. Exper. Med., v. 75:83-125. 



Hume, H. V., Denis, W., Silverm.^n, D. N. and Irwin, E. L. 

 1924. — Hydrogen ion concentration in the human duo- 

 denum. J. Biol. Chem., v. 60:633-645. 



Jahn, T. L. 1933. — Oxidation-reduction potential as a possible 

 factor in the growth of intestinal parasites in vitro. J. 

 Parasit., v. 20:129. 



1934. — Problems of jjopulation growth in the protozoa. 

 Symposia in Quant. Biol. (Cold Spring Harbor), v. 2:167- 

 180. 



1936. — Effect of aeration and lack of CO2 on growth 

 of bacteria-free cultures of protozoa. Proc. Soc Exp. 

 Biol. & Med., v. 33:494-498. 



Jbphcott, H. and Bacharach, A. L. 1926. — A rapid and re- 

 liable test for vitamin D. Biochem. J., v. 20:1351-1355. 



Johnston, P. 1934. — Threadworms. Brit. Med. J., v. 1:224. 



Kahn, G. and Stokes, J. 1926. — The comparison of the elec- 

 trometric and colorimetric methods for determination of 

 the pH of gastric contents. J. Biol. Chem., v. 69:75-84. 



Karr, W. G. and Abbott, W. O. 1935. — Intubation studies of 

 the human small intestine. IV. Chemical characteristics 

 of the intestinal contents in the fasting state and as in- 

 fluenced by the administration of acids, of alkalies, and 

 of water. J. Clin. Invest., v. 14:893-900. 



Kellogg. E. L. 1933.— The duodenum. P. B. Hoebcr, Inc., 



N. Y. 



KoPOiD, C. A., McNeil, E. and Cailleau, R. 1932. — Electro- 

 metric pH determinations of the walls and contents of the 

 gastrointestinal tracts of normal aIl)ino rats. Univ. Calif. 

 Pub. Zool., v. 36:347-355. 



KoPELorF, N. 1926. — Lactobacilliif: acidophilus. Baltimore, 

 1926. 



Kreipe, H. 1927. — Dissertation. Kiel. Cited by Lenkeit 

 (1933). 



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