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52. Marshall, E. K., Jr. The secretion of urine. Physi- 

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53. Marshall, E. K., Jr. The comparative physiology 

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54. Prosser, C. L., D. W. Bishop, F. A. Brovtn, Jr., 

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58. Robertson, J. D. Ionic regulation in some marine 

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59. Smith, H. W. The composition of the body fluids of 

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60. Smith, H. W. The composition of the body fluids of 

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'Salt and Water by M. B. Strauss is quoted vdth per- 

 mission from Welt, L. G., Clinical Disorders of Hydra- 



