PLATE 3 



EXPLANATION OF FIGURES 



5 Pigment cells in the corium of skin of face; a, cell with granules unstained; 

 b, cell containing both stained and unstained granules; c, cell with granules 

 stained. Stained intra vitani with methylene blue, and fixed in ammonium molyb- 

 date. X 750. 



8 Portion of transverse section of skin of back; ep, eindermis; fe, nerve fiber 

 giving one branch to hair follicle and one to epidermis; .|f, whole fiber ending in 

 hair follicle. Stained intra vitam with methylene blue, and fixed in ammonium 

 molybdate. X 166. 



9 Longitudinal section of hair follicle; drawn from a methylene blue prepara- 

 tion, but some features of the hair sheaths added from other preparations; cs, 

 connective tissue sheath; eh, nerve endings on hyaline membrane; eo, nerve end- 

 ings in outer root sheath; /, fibrils from superficial nerve ring; fe, nerve fiber giv- 

 ing one branch to hair follicle and one to epidermis ; ff, whole fiber ending in single 

 follicle; h, hyaline membrane; hs, hair shaft; o, outer root sheath; sgl, sebaceous 

 gland; s)i. superficial nerve ring. Stained intra vitam with methylene blue, and 

 fi.xetl in ammonium molybdate. Other features from preparations fixed in 

 Zenker's fluid, and stained in hematoxylin and eosin. X 750. 



13 Portion of transverse section of wing membrane showing varicosity on 

 fiber terminating in epidermis; mal, stratum Malpighii; sc, stratum corneum; ra, 

 varicosity. Stained intra vitam with methylene blue, and fixed in ammonium 

 inolvbdate. X 1500. 



340 



