DR. BEALE, ON THE TISSUES. 187 



have been determined, such as the relation of the cells of 

 the liver to the terminal branches of the duct ; the ultimate 

 distribution of nerve-fibres in several different tissues; the 

 structure of the ganglia of the sympathetic ; the relation of 

 the terminal branches of the nerves to the dentinal tissues. 

 Nerves have been readily traced and microscopical ganglia 

 demonstrated in the fibrous tissue of the pericardium, in the 

 submucous tissue of the epiglottis and pharynx, in the trans- 

 verse fissure of the liver, and in the substance of the tongue ; 

 the formation of bone and dentine has been studied under 

 the highest magnifying powers. The tissues may be pre- 

 served permanently, and examined with the highest powers. 



The lecturer had been led to differ in opinion upon some 

 very important questions, from many of the highest au- 

 thorities; for instance, as to whether certain appearances 

 depend upon the presence of solid bodies in the tissues, or 

 are spaces containing fluid ; whether certain delicate lines 

 are fibres or tubes ; which is the oldest and which is the 

 youngest part of a tissue ; and also as to the offices performed 

 by tissues, &c. 



He thought that many of the most difficult questions can 

 only be solved by studying very carefully the circumstances 

 under which the tissues in question may be examined, so as 

 to display their characteristic peculiarities in the clearest 

 manner possible. The following specimens were selected for 

 illustration. 



Specimens passed round. — No. 1. An injection of some 

 simple papillae of the human tongue under a magnifying 

 power of 130. Three separate ones were seen. The epithe- 

 lium had been removed and the capillaries fully injected with 

 Prussian blue. Oval bodies, consisting of germinal matter, 

 tinged bright red with carmine, passed in various directions 

 in the papillae, and were very numerous at the summit of 

 each. Of these oval bodies, some were connected with the 

 capillary vessels ; but the great majority were connected 

 with the nerves forming a sort of network lying on the 

 surface of the capillary vessels, and imbedded in a transparent 

 tissue. No. 2. A thin section removed from the central part 

 of the tongue of a white mouse, prepared as the last specimen, 

 and placed under a power of 215. The muscular fibres were ob- 

 served with capillaries ramifying over them. The oval nuclei 

 were principally connected with the capillaries and nerves. 

 These specimens illustrated the general appearance of the ca- 

 pillaries when injected with Prussian blue, and the oval bodies 

 when stained with carmine. No. 3. A thin section from the 

 tongue of a mousr just killed, placed in a little weak glyce- 



