42 



of the kidney, as the labours of Beale appear to have shown ; 

 failure to demonstrate this latter point being attributed to 

 want of success in the injecting process — a matter of no 

 inconsiderable difficulty, as the entire organ (that of the 

 young pig) Avas but an inch in length, and the artery, there- 

 fore, exceedingly small. It is hoped that further attempts 

 will accomplish this, though Dr. Beale himself, of whose 

 observations these are a repetition, makes no allusion to 

 having found the nerves upon the tubules and vessels of the 

 pig's kidney, but has demonstrated them most satisfactorily 

 in this portion of the kidney of the frog and newt, as will be 

 learned later. 



Tig. 1. 



The preparations were made from the kidney of the new- 

 born pig, which was treated as nearly as possible after the 

 method of Dr. Beale — staining with carmine, washing with 

 dilute glycerine (2 glycerine, 1 water), and finally preserv- 

 ing in acetic acid glycerine (5 drops to oz.). In this latter 

 solution, also, have the preparations been mounted. 



The appearances can be well traced in the diagrams which 

 I have had prepared (Figs. 1 and 2). In Fig. 1 is shown a 

 bundle of fine nerve-fibres, characterized by the presence of 

 germinal matter at different parts, and longitudinally through- 

 out their course, dividing at the points a and b, and expand- 

 ing into large ganglion-cells at c, with each extremity of 

 which a nerve-fibre is continuous. Fig. 2 exhibits a finer 

 set of nerve fibres, constituting a network in the vicinity and 

 immediately about the arteriole, easily distinguished, though 



