72 



MANUAL OF HISTOLOGY. 



UK '>h work, a. It does not appear as if the fibrilhe anastomose 

 with one another, though this point cannot now be definitely 

 settled. It must be stated that some of these fibrils are possi- 

 bly nerve-elements, and yet this is doubtful, because they do 

 not even seem to be connected with the nerve-fibres ' that are 

 distinctly shown by this method of preparation. 



Granular appearances are always noted in the brain, which 

 is to be expected when cross-sections are made of the delicate 

 fibrillfe. Three kinds of corpuscles are met with in the brain 

 and medulla. The first are the variously shaped ganglionic 

 corpuscles or cells, Fig. 28, 5, b, b ; secondly, the ordinary 

 lymphoid cells, c, c, which are generally seen to have a pale 

 envelope about them ; lastly, smaller corpuscles, d. d, of irre- 

 gular shapes, and many of them undoubtedly flattened and 

 appearing to have branching processes. They may be found 

 in considerable numbers, and can be isolated so that there is no 

 doubt that they exist. 



The fibrillje of the neuroglia do not differ substantially in 

 size from the fibrillje of fibrous tissues elsewhere. 



Tendon-tissue (Fig. 29). Tendon-tissue may be well studied 



in the gastrocnemius of the 

 frog. It is prepared like 

 the preceding. If, how- 

 ever, it is desirable to show 

 the nuclei in adult tissue, 

 it is well to use nitrate of 

 silver. Cut a thin section 

 of a fresh tendon and ex- 

 pose it for a few minutes 

 in a \ per cent, solution 

 of nitrate of silver, until 

 the section is turbid or 

 milky, then place in the 

 sunlight, and in a few min- 



Fio. 29.-Tend<m-tis8ue from the frog. .... . 



utes the turbid color will 



give place to dark brown or black, owing to the deposit of 

 silver, and the tissue may then be mounted in glycerine and 

 examined. 



This method will show the corpuscular bodies to advantage. 



1 To avoid confusion they are not represented in the drawing. 



