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72. Needham, J., Biochemistty and Morphogenesis. (1942). Cambridge Univ. Press. 

 787 p. 



73. Needham, J., Brachet, J., and Brown, R., /. Exper. Biol 12:321 336 (1935). 

 Nitrogen excretion in chick embryos. 



74. OsTERBERG, E., and Wolf, C G. L., Biochem. Ztschr. 5:304-343 (1907). Urinary 

 nitrogen, dog. 



75. Peters, J. P., and van Slyke, D. D., Quantitative CHnical Chemistry (1946). 

 Baltimore, Williams and Wilkins. Vol. 1. Biochemical interpretations. 



76. Pryzlecki, S. J., Arch. Internat. Physiol. 26:33-53 (1926). Purine degradation. 



77. Rocco, M. L., C. R. Acad. Sci. 202:1947-1948 (1936). Allantoinase in insects. 



78. Schmidt-Nielsen, S., and Holmsen, J., Arch. Internat. Physiol. 18:128-132 

 (1921). Composition of whale urine. 



79. Smith, H. W., /. Biol. Chem. 81:727-742 (1929). Nitrogen excretion by gills 

 of fish. 



80. Smith, H. W., /. Biol. Chem. 88:97-130 (1930). Nitrogen excretion in lungfish, 

 Protopterus. 



81. Smith, H. W., Am. ]. Physiol. 93:480-505 (1930). Excretion by marine fish. 



82. Smith, H. W., ]. Cell. & Comp. Physiol. 7:465-473 (1936). Nitrogen in seal 

 urine. 



83. Smith, H. W., and Silvette, H., /. Biol. Chem. 78:409-411 (1928). Nitrogen 

 excretion in camels. 



84. Specht, H., /. Cell. & Comp. Physiol. 5:319-333 (1934). Ammonia production, 

 Spirostomum. 



85. Spitzer, J. M., Zool. ]ahrh., Aht. allg. Zool. u. Physiol. 57:457-496 (1937). 

 Nitrogenous excretion and distribution of molluscs. 



86. Steudel, H., and IzuMi, S., Z(sc?ir. PhysioL C?7eni. 129:188-194(1923). Purine 

 nitrogen excretion in rat. 



87. Strunk, C, Zool. ]ahrh., Abt. allg. Zool. h. Physiol. 52:216-222 (1932). Urea, 

 uric acid in coelomic fluid, Arenicola. ' 



88. Sulima, a., Ztschr. Biol. 63:223-244 (1914). Uric acid formation, invertebrates. 



89. Truszkowski, R., C. R. Soc. Biol. 98:1048 (1928). Purine breakdown, leech, 

 mussel. 



90. Truszkowski, R., and Chajkinowna, S., Biochem. ]. 29:2361-2365 (1935). 

 Uricolysis. 



91. Van Slyke, D. D., et AL., ;. Bfo/. C/iew. 150:481-482(1943). Glutamine source 

 of urine NH3. 



92. Walker, A. M., and Hudson, C. L., Am. ). Physiol. 118:153-166 (1937). Urea 

 secretion by amphibian kidney. 



93. Weatherby, J. H., Physiol. Zool. 2:375-394 (1929). Nitrogen excretion by 

 Protozoa. 



94. Weese, a. O., Science 46:517-518 (1917). Urinary nitrogen, Phrynosoma. 



95. WiGGLESwoRTH, V. B., /. Exper. Biol. 8:411-427 (1931). Uric acid in urine of 

 bug, Rhodnius. 



96. WiGGLESwoRTH, V. B., Principles of Insect Physiology (1939). London, Methuen. 

 Ch. 12. Excretion. 



97. WiLBER, C. G., ;. Ce/L & Cowp. P/rysio/. 31:107-109(1948). Uric acid in body 

 fluids of marine invertebrate animals. 



98. Wiley, F. H., and Lewis, H. B., Am. ). Physiol. 81:692-695 (1927). Nitrogen- 

 ous excretion in turtle. 



99. YuNGHERR, I., and Matterson, L. D., Proc. 48th Ann. Meet.. U. S. Livestock San. 

 Ass., pp. 185-196 (1944). Chicken uric acid. 



