208 THE EXCRETORY SYSTEM 



Gray, P. 1932. The development of the kidney of Triton vulgaris and a 



comparison of this form with Rana temporaria, Quart. Jour. Micr. Sci., 



75, 425. 

 HoLTON, S. G., AND Bensley, R. R. 1931. The function of the diiTerentiated 



parts of the uriniferous tubule in the mammal. Am. Jour. Anat., 47, 241. 

 Singer, E. 1934. Observation of the frog's kidney with the fluorescence 



microscope, Am. Jour. Anat., 53, 469. 

 Steen, W. B. 1934. Special secretory cells in the transverse ducts of the 



frog's kidney, Anat. Rec, 61, 45. 

 Stroer, W. F. H. 1932. The development of the pronephros in the common 



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See Appendix also. 



