208 BIOLOGICAL EFFECTS OF RADIATION 



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37. Harrison, G. R. Current advances in photographic photometry. Jour. Opt. 

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38. Henning, F., and H. T. Wensel. The freezing point of iridium. Bur. Stand. 

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39. Hughes, A. L., and L. A. DuBridge. Photoelectric phenomena. McGraw-Hill 

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40. Ives, H. E. Mechanical equivalent of light. Internat. Crit. Tables 5 : 436-438. 



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41. JuDD, D. B. Extension of the standard visibility function to intervals of one 

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42. JuDD, D. B. The 1931 I. C. I. standard observer and coordinate system for 

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43. Kimball, H. H. Records of total solar radiation intensity and their relation to 

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44. Kimball, H. H. Solar radiation as a meteorological factor. Rev. Mod. Phys. 



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45. Knudsen, E. Chromatische disperse Zweiphasensysteme unter besonderer 

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46. Laurens, H. Physiological effects of radiant energy. Chemical Catalog Com- 

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47. LucKiESH, M. Spectral reflectances of common materials in the ultra-violet 

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48. Marsh, H. E., E. Condon, and L. B. Loeb. The theory of the radiometer. 

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49. McAlister, E. D. The spectrum of the neutral mercury atom from 1/j to 2m. 

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50. McAlister, E. D. Absolute intensities in the visible and ultra-violet spectrum 

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52. Meier, Florence. Lethal action of ultra-violet light on a unicellular green alga. 

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53. Mestre, Harold. Absorption of energy by leaves and algae. Cold Spring 

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54. Morton, R. A., and I. M. Heilbron. The absorption spectrum of vitamin A. 

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55. O'Brien, Brian, and V. L. Parks. Photographic reciprocity and intermittency 

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56. Report Opt. Soc. Amer. Progress Committee for 1922-1923. Spectrophotometry. 

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57. Report Division of Radiation and Organisms. Rept. Smithsonian Inst. (Appen- 

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