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52. Laurens, H. The physiological effects of radiant energy. 610 pp. Chemical 

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53. Leigh-Clare, J. L. A search for vitamin D in the diatom Nitzschia closterium 

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56. MacLeod, F. L. The chemistry of vitamin D. Jour. Nutrition 2: 517-530. 

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57. Marshall, A. L., and A. Knudson. The formation of vitamin D by mono- 

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58. Medical Research Council. Special Report Series, No. 167. Vitamins: a 

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59. Moore, R. B., and T. DeVries. The activation of ergosterol with radium 

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60. Moore, T. The relation of carotin to vitamin A. Lancet 1929, 2 : 380-381. 



61. Morton, R. A., I. M. Heilbron, and E. D. Kamm. The absorption spectrum 

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63. PoHL, R. Tiber das Absorptionsspektrum des antirachitisch wirksamen 

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64. PoHL, R. tjber das Absorptionsspektrum des antirachitischen Provitamins und 

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65. Reerink, E. H., and A. van Wijk. The vitamin D problem. I. The photo- 

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66. Rekling, E. Untersuchungen liber die Wirkungsart des Lichtes bei experi- 

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67. Rosenheim, O., and T. A. Webster. Rickets and cholesterol. Lancet 1925, 

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68. Rosenheim, O., and T. A. Webster. The anti-rachitic properties of irradiated 

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69. Rosenheim, O., and T. A. Webster. Further observations on the photo- 

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70. Rosenheim, O., and T. A. Webster. On the nature of the parent substance of 

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71. Rosenheim, O., and T. A. Webster. The photochemical production of vitamin 

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72. Rosenheim, O., and T. A. Webster. The parent substance of vitamin D. 

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73. Rowan, W. Bird feathers and the antirachitic vitamin D. Nature 121: 

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74. Russell, F. S. Vitamin content of marine plankton. Nature 126 : 472. 1930. 



75. ScHLUTz, F. W., and M. Morse. Some spectroscopic observations on cod 

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