DISTRIBUTION OF NON-MEDULLATED NERVE-FIBRES. 21 



creosote fluid (see Beale's ' How to Work,' &c.), useful for 

 urinary casts, pus, and epithelium. 



Cells for Microscopic Objects. — a. For dry objects use cells 

 made of tinfoil, paper, cardboard, dammar varnish, putty, or 

 glass. B, For wet objects use glass cells. 



Cements. — Don't use Brunswick black (asphalt). I find 

 dammar varnish the best for common purposes. I use a 

 thick solution of gum dammar in benzole i^not henzoline^. 

 The very best varnish is, however, the Dammar mounting 

 fluid (see above) thickened by drying. 



On the Peripheral Distribution of Nox-medullated 

 Nerve-Fibres. By Dr. E. Klein, Assistant- Professor at 

 the Brown Institution Laboratory (with plates I — IV.) 



Part II.i 



A. Nerves of the Nictitating Membrane. 



In the first part we gave a full account of the methods 

 by which the nerves of the cornea are made out, both 

 in the rabbit and in the frog ; and, at the same time, we 

 took the opportunity of asserting that, provided these 

 methods are adopted, no difficulty whatever will be expe- 

 rienced in following out the finest nerves to their extreme 

 ramifications. 



It is not such a simple matter with the nictitating mem- 

 brane of the frog. In the first place, in the case of this 

 membrane, we have to do with an organ possessing a struc- 

 ture of extraordinary complexity. In the thin nictitating 

 membrane there are crowded together, on a comparatively 

 small extent of surface, structures widely different in kind ; 

 as, for example, two varieties of epithelium, glands, a rich 

 network of blood-vessels, and very abundant cellular struc- 

 tures of various appearance and properties, from all which 

 result very complicated relations of the nerves. In the 

 second place, the following out of the finest non-meduUated 

 nerves in gold preparations (and only such preparations can 



^ I find, at the last moment, that I am compelled to give a third part iti 

 the next or April number; first, because I have not been able to iiitio- 

 duce into the present one all the plates I had prepared (ou account of 

 the necessary limitation to the number of illustialions iu each part) ; and, 

 secondly, because 1 have arrived at several new facts respecting the nerves 

 of the tongue of the frog. These and the nerves of the ciliated passage 

 found in the tail of the rabbit will make up the subjects of Part III. 



