MINUTE ANATOMY OF PAPILLARY RIDGES 77 



with the view of showing the main structures of the covering 

 of the hand and foot, and it may be taken as a type of the various 

 modifications of the skin in lower mammaUan forms, the essential 

 features being preserved in most of these. Indeed this is well 

 borne out by the diagram (Fig. 52b) * of a section of the skin of 

 the hand of Macacus cynomologus, which is also given by way 

 of comparison. 



The more minute anatomy of the skin is not referred to, as it 



Fig. 52a. — Section of Human Skin op Palmar Surface. Drawing copied 

 from " Quain's Anatomy," vol. i. pt. 2, p. 413. 



a, stratum corneum ; h, stratum malpighii ; c, corium ; d, crest of papillary 

 ridge ; e, furrow of papillary ridge ; /, opening of sudoriparous duct ; 

 /I, sudoriparous duct; k, stratum lucidum, 



is the object of this work to show only the variations in different 

 animal forms of the outlines of the papillae of the corium and the 

 papillary ridges of the epidermis. It is very Hkely that further 

 investigations will be made into the nerve-supply of the papillae 

 of the lower animals, and that these structures in the case of man 

 will be further worked out than they have been. But for the 

 present purpose, it is not necessary to employ methods of staining 

 for bringing out the variations of nerve-endings and nerve-fibrils 

 in different animals and different parts of their palmar and 



* Schlaginhaufen, " Gegenbauer's Morph. Jahrb.," vol. xxxiii. 



