2500 



30 35 



□ 



Wavelength A 



4000 



2300 



25 



27 



o 



Wavelength A 



3000 



Fig. IV-8. Curve 1 shows how the transmissivity of an 0.08-mm layer of human 

 epidermis varies with wavelength. Note its rapid rise in transparency near 

 3000 A. Curve 2 shows the relative greater transparency of human sweat, 1 mm 

 thick, in the ultraviolet. The lower curves show how the extinction coefficient k 

 can be used to compare the absorption of (3) egg albumin, pH 1.65 (L. E. Arnow 

 [1935]), with (4) serum pseudoglobulin, and (5) serum albumin. Note characteristic 

 absorption band at 2790 A. (F. C. Smith [1929].) 



146 



