BY DR. KLEIN. 91 



authors in the mucous membrane of the epiglottis, from which 

 it would appear that nerve fibres, either medullatcd or others, 

 end under the epithelium in club-shaped. bodies, consisting of 

 granulous substance, each of which contains one or two nuclei, 

 and is inclosed in a prolongation of the Schwann's sheath of 

 the nerve. In the mucous membrane of the frog's stomach it 

 is also stated that the nerve fibres end between the cylindrical 

 elements of the epithelium in oval or club-shaped swellings. 

 Again, in the connective tissue of the bladder of the frog, are 

 to be found cells which consist of a fine granulous protoplasm, 

 and contain several nuclei. In the skin of the wing of the bat, 

 and in the skin of the ears of mice, the medullated nerves come, 

 at certain parts, into remarkable relation with the papillae of 

 the hairs (See Chapter XL). 



Peripheral Branching of the Non-Medullated 

 Nerve Fibres in Different Tissues. Under this head 

 will be described the termination of the nerves in the cornea, 

 conjunctiva, in the tail of the tadpole, in the skin in certain 

 mucous membranes, in unstriped muscular fibres, in striped 

 muscular fibres, in bloodvessels, and in glands. The nerve 

 endings of organs of special sense will be described hereafter. 



Nerves of the Cornea. In a living or recently killed 

 rabbit, the cornea is excised close to the limbus, and placed in 

 chloride of gold solution for three-quarters of an hour. The 

 preparation is then transferred to distilled water, in which it 

 remains until it has attained a steel-gray color, the time re- 

 quired varying, according to the season, from six hours to six- 

 teen or twenty. Thence the object is transferred to a small 

 wide-mouthed vessel, which contains a small quantity of nearly- 

 concentrated, filtered solution of tartaric acid. As soon as it 

 has had time to absorb the liquid, its color becomes deeper, 

 and changes to grayish-violet. If Lhe bottle is then plunged 

 into water at a temperature of 40 to 50 C., to such a depth 

 that both liquids stand at the same level, the preparation as- 

 sumes, after a few minutes, an intense violet-red color, which 

 goes on increasing until it attains a dirty brownish-red, and 

 exhibits a velvety lustre. The cornea is now removed, and 

 steeped in distilled water for two hours or more. The epithe- 

 lium, along with a thin layer of corneal substance, is then 

 stripped off with the aid of the pointed forceps, beginning from 

 the sclerotic beyond the edge. In a preparation thus obtained, 

 it is seen that there exists in the anterior, i. e. most superficial, 

 layer of the cornea propria, a plexus of nerves of various 

 breadth ; each of these nerves consists of a bundle of minute 

 fibrils, invested in a pale Schwann's sheath with oblong nuclei, 

 within which they may either run parallel to each other, or wind 

 round each other in a more or less spiral manner. Wherever 

 a bifurcation occurs, or two nerves join, there is an enlarge- 



