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5. Baldwin, E., Comparative Biochemistry (1939. Cambridge Univ. Press. 107 p. 

 Ch. IV, pp. 43-61. Nitrogen excretion. 



6. Baldwin, E., Dynamic Aspects of Biochemistry (1947). New York, Macmillan. 

 Ch. 10, 12. Nitrogenous products. 



7. Baldwin, E., and Needham, J., Biochem. ). 28:1372-1392 (1934). Arginase in 

 snail liver. 



8. Brown, A. VV. A., /. Exper. Biol. 13:131-139 (1936). Nitrogenous excretion, fly 



larvae. 



9. Brown, A. W. A., /. Exper. BJoL 14:87-94(1937). Nitrogenous excretion, grass- 

 hopper, Melanoplus. 



10. Brown, A. W. A., Biochem. ]. 32:895-902, 903-912 (1938). Nitrogen metabolism, 

 insect Lucilia. 

 ^11. Brunel, a., Bull. Soc. Chem. Roy. Biol. 19:805-826, 1027-1036, 1683-1696 

 (1937). Purine metabolism, elasmobranchs, teleosts and amphibians. 



12. Brunel, A., C. R. Acad. Sci. 206:858-860 (1938). Purine metabolism, Mytilus. 



13. Chaudhuri, a. S., ;. Exper. Biol. 5:97-101 (1927). Arginase in fowl. 



14. Cohen, S., and Lewis, H. B., Fed. Proc. 8:191 (1949). Nitrogen metabolism, 

 earthworm. 



15. Conway, E. J., and Cooke, R., Biochem. ). 33:479-492 (1939). Deaminases in 

 rabbit tissues, ammonia in blood. 



16. CouRTOis, A., C. R. Soc. Biol. 101:365-366(1929). Nitrogenous composition of 

 meconium, Lepidoptera. 



17. Cunnningham, B., and Kirk, P. L., /. Cell. & Comp. Physiol. 18:299-316 (1941). 

 Nitrogen excretion of Paramecium. 



18. Davis, R. E., /. Biol. Chem. 74:509-513 (1927). Nitrogenous constituents of 

 hen urine. 



19. Delaunay, H., Btill. Sta. hiol. Arcachon 21:41-84 (1924). Nitrogen excretion, 

 invertebrates. 



20. Delaunay, H., C. R. Soc. Biol. 94:1289-1290 (1926). Nitrogen excretion, star- 

 fish. 



21. Delaunay, H., Bull. Sta. hiol. Arcachon 24:95-214 (1927). Nitrogen excretion, 

 mostly invertebrates. 



22. Delaunay, H., C. R. Soc. Biol. 101:371-372 (1929). Nitrogen excretion, fish. 



23. Delaunay, H., Biol. Rev. 6:265-301 (1931). Review of nitrogen excretion. 



24. Delaunay, H., Ann. Physiol. Physicochim. hiol. 10:695-724 (1934). Review, 

 nitrogen excretion. 



25. Doyle, W. L., and Harding, J. P., ). Exper. Biol. 14:462-469 (1937). NHa 

 excretion, Glaucoma. 



26. DucHATEAu, C, Florkin, M., and Frappez, C, C. R. Soc. Biol. 134:115-116 

 (1940). Purine breakdown, Protopterus. 



27. DucHATEAu, B., Florkin, M., and Frappez, C, Bull. Acad. Roy. de Med. de 

 Belg., CI. Sc. 27:169-173 (1941). Distribution of deaminases of purines and 

 nucleosides. 



28. Edlebacher, S., and Rothler, H., Ztschr. physiol. Chemie 148:264-282 (1925). 

 Arginase distribution, birds and mammals. 



29. Emery, F. E., ). Morph. 45: 555-577 (1928). Amino acid utilization, NHa 

 production, Paramecium. 



30. Fearon, W. R., Physiol. Rev. 6:399-439 (1926). Biochemistry of urea. 



31. Florkin, M., C. R. Soc. Biol. 133:274, 433, 436 (1940). Deaminases in crusta- 

 ceans, lamellibranchs, insects. 



32. VLOKKm, M., Arch. Int. Physiol. 53:117-120(1943). Ammonia in blood. 



33. Florkin, M., L'Evolution Biochimiquc (1944). Paris, Masson, 210 p. 



34. Florkin, M., Biochemical Evolution, transl. and ed. by S. Morgulis. (1949). New 

 York, Academic Press, 157 p. 



35. Florkin, M., and Duchateau, S., Bull. Acad. Roy. de med. de Belg. CI. Sc. 

 27:174-178 (1941). Xanthine oxidase distribution. 



36. Florkin, M., and Duchateau, G., Arch. Internat. Physiol. 52:261-290. (1942) 

 Nitrogen metabolism of Sipunculus. 



' 37. Florkin, M., and Duchateau, G., Arch. Internat. Physiol. 53:267-290 (1943). 

 Evolution ol purine metabolism. 



