Plate 17 



Section of the fibrous keratin in the keratinized cells of the guinea-pig 

 epidermis. The pattern of light filaments embedded in a dense matrix is 

 in essentials identical with that of the well-oriented hair shown in Plates 

 15 and 16, but the orientation is here less perfect and filaments seem 

 to run in bundles in various directions. 

 Photograph kindly lent by Dr. I. Brody. 



