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265. Olthof, H. J., Proefschrift (Dissertation) (1941). Groningen. Factors regu- 

 lating respiration. 



266. Oppenheimer, K., and Stern, K. G., Biological Oxidation (1939). The Hague, 

 Junk. 



267. Orr, p. R., Physiol. Zool. 10:235-243 (1937). Sex differences in metabolism; 

 Drosophila. 



268. Otis, A. B., Rahn, H., and Fenn, W. O., Am. ). Physiol. 152:674-686 (1948). 

 Factors influencing breath-holding time. 



269. Pace, D. M., and Kimura, K. K., /. Cell. & Comp. Physiol. 24:173-185 (1944). 

 Respiration in Paramecium. 



270. Pace, D. M., and Lyman, E. D., Biol. Bull. 92:210-216 (1947). Oxygen con- 

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^ 271. Palmhert, H. W., Zool. ]ahrh., Alt. dig. Zool. u. Physiol, d. Tiere 53:212-260 

 (1933). Respiration and critical oxygen tension; hydroid. 



272. Parhon, M., Ann. Sc. Natur. 9:1-58 (1909). Bee metabolism during flight. 



273. Parker, W. N., Tr. Roy. Irish Acad. 30:109-230 (1892). Lungfish respiration. 



274. Pearse, A. S., Carnegie Inst., Wash., Tortugas Papers, Publ. 391, pp. 205-223 

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275. Pearse, A. S., The Migrations of Animals from Sea to Land (1936). Duke Univ. 

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276. Pearson, O. P., Ecology 28:127-145 (1947). Mammalian respiration. 



277. Pearson, O. P., Science 108:44-46 (1948). Metabolism of small mammals. 



278. Pennak, R. W., and McColl, C. M., J. Cell & Comp. Physiol. 23:1-10 (1944). 

 DamselHy respiration. 



279. Pennoit-de CooMAN, E., Awn. Soc. Roy. Zool. Belg. 71:76-80(1940). Cestode 

 metabolism. 



280. Peters, F., Ztschr. vergl. Physiol. 25:591-611 (1938). Respiratory control; cray- 

 fish. 



281. Pfluger, E., Pftiig. Arch. 10:251-367 (1875). Anaerobiosis; frog. 



282. Philips, F. S., Biol. Bull. 78:256-274 (1940). Tolerance to O2 lack; fish eggs. 



283. Pi-Suner, a., Physiol. Rev., 27:1-38 (1947). Peripheral control of respiration. 



284. Pitts, R. F., Physiol. Rev. 26:609-630 (1946). The respiratory center. 



285. Pitts, R. F., in Howell's Textbook of Physiology (John F. Fulton, ed.) (1949). 

 Philadelphia, Saunders. Chap. 41, 42. 



286. Pitts, R. F., Magoun, H. W., and Ranson, S. W., Am. J. Physiol. 126:673-688 

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287. Potter, G. E., ). Exper. Zool. 49:45-67 (1927). Swim bladder; lung fish. 



288. PouLSON, D. F., Ztschr. vergl. Physiol. 22:466-472(1935). Oxygen consumption 

 of Drosophila larvae. 



289. Powers, E. B., Hopkins, F. G., Hickman, T. A., and Shipe, L. M., EcoI. Monog. 

 2:385-473 (1932). Respiratory adaptations; fish. 



290. Precht, H., Ztschr. vergl. Physiol. 26:696-739 (1939). Respiratory control; 

 pulmonate snails. 



291. Prosser, C. L., Physiol. Rev. 26:337-382 (1946). Respiratory rhythm and 

 ganglionic potentials; insect. 



292. Raeder, J. C, Biochem. Ztschr. 69:257-288 (1915). Respiration and urethane 

 narcosis. 



293. Raffy, a., and Portier, P., C. R. Soc. Biol. 108:1062-1064 (1931). Butterfly 

 metabolism during flight. 



294. Rahn, H., and Otis, A. B., Atn. ). Physiol. 150:202-221 (1947). R.Q. and 

 anoxia. 



295. Rahn, H., and Otis, A. B., Fed. Proc. 7:96-97 (1948). Acclimatization to anoxia. 



296. Rahn, H., Otis, A. B., and Fenn, W. O., Fed. Proc. 6:183 (1947). CO. and 

 O2 as respiratory stimulants. 



297. Redfield, A. C, Coolidge, T., and Hurd, A. L., ./. BioL Chem. 69:475-509 

 (1926). Oxygen transport by haemocyanin; Busycon. 



298. Redfield, A. C, and Florkin, M., Biol. Bull. 61:185-210 (1931). Gas exchange 

 in hind gut; Urechis. 



299. Regnault, V., and Reiset, J., Ann. Chim. e. Phys., 3rd Ser. 26:299-519 (1849). 

 Oxygen consumption of vertebrates. 



