PROGRESS OF MICROSCOPICAL SCIENCE. 89 



small, round, cloudy patches. The evidence of the identity of the 

 stomata, brought into view by raeans of the cinnabar, with those 

 rendered evident by the nitrate of silver, is obtained by observing 

 their peculiar grouping, and by the subsequent injection of nitrate 

 of silver into the same vessels. The injection of the cinnabar 

 causes very little disturbance of the circulation. If a lively exodus of 

 the white corpuscles from the blood-vessels be produced by making an 

 abrasion of the surface, the migrating cells quickly make their appear- 

 ance in the stomata of the lymphatics marked out by the cinnabar. 

 They then take up the particles of the cinnabar into their interior, 

 which causes them to lose their activity and accumulate in the stomata. 

 They then appear in the form of cauliflower excrescences, projecting 

 into the interior of the lymphatics, which gradually break up into 

 their constituent cinnabar-holding cells. These may be traced into 

 the larger vessels, and from them into the blood. In these researches, 

 a remarkable regularity, or uniformity, in the track pursued by the 

 white cori^uscles, was observed. They pass away from the blood- 

 vessels nearly at right angles into the tissues, their course, however, 

 being in a series of short zigzags. They all appear to travel about 

 the same pace. 



Persistence of Sensibility in the Peripheric Ends of Cut Nerves. — 

 A i)aper on this by MM. Arloing and Trij^ier, is thus abstracted in 

 the ' Medical Eecord,' June 17th, by Dr.B. MacDowal :— 1. The facial 

 and the spinal nerves of solijieds and rodents possess recurrent sensi- 

 bility as well as those of carnivora. 



2. To find recurrent sensibility most readily, one must go to the 

 periphery, 



3. The peripheric end of the branches of the trigeminus nerve is 

 sensible. This sensibility is somewhat difficult to demonstrate ; still 

 it exists. 



4. The peripheric end of the nerves of limbs is also sensible. The 

 sensibility may, however, disappear towards the nerve trunks. 



5. In any case, the sensibility of the peripheric end is due to the 

 presence of nerve tubes, the relations of which with the trophic and 

 perceptive centres have not been interrupted by the section. 



6. The absence of these tubes implies sensibility of the peripheric 

 end. 



7. These tubes proceed from the fifth pair, for the facial ; from 

 neighbouring nerves, and occasionally from nerves of the ojiposite 

 side, for sensitive nerves ; from neighboui'ing and homologous nerves, 

 for the mixed nerves. 



8. These recurrent nerves rise more or less high in the trunk of 

 the nerve to which they are connected ; their number diminishes from 

 the periphery to the centre. 



9. The return of these fibres may take place before the termination 

 of the nerves, but the termination is the part where it is made by 

 preference. 



10. For several reasons, MM. Arloing and Tripier think that the 

 sensibility of the perii^heric end belongs to all nerves ; and that it 

 probably exists in all animals of the class mammalia at least. 



