198 
071 the Structure and Develoj)ment of 
exception, for it seems, in fresli specimens, when the substance has 
been swollen by immersion in water, to be oval and flattened in 
whatever position it is placed. The bundles upon which these 
bodies are placed are cylindrical in form, branched, and composed 
of separate filaments, which can be separated by Miiller's fluid, or 
a 10 per cent, watery solution of common salt. Two other forms 
of corpuscles may also be noticed, the kind observed by Waldeyer 
(loc. cit.), and thought by him to be those that take up fat to 
make fat tissue, bodies four or five times the size of a lymphoid 
corpuscle, and rounded in form, containing a central body, and the 
ordinary lymphoid corpuscles seen at times in all tissues. 
The form of fibrous tissue that occurs in parallel bundles is 
well shown in the mesentery of the frog, and in serous membranes 
generally. No great difficulty will be met with in preparing this 
tissue, for it is only necessary to remove it from the frog in the 
fresh state, acidulate it in a weak (1 per cent.) watery solution 
of acetic acid, and mount it in glycerine. 
It will be seen that these so-called spindle cells are really 
flattened plates when viewed flatwise, and generally of an irregu- 
larly quadrilateral form, though the form varies somewhat in each 
instance (Fig. 5). [What relation these corpuscles bear to the 
interfascicular lymph-spaces described by Klein was not determined, 
as the silver method was not used. The bodies here described cor- 
respond very closely with those figured by this author, who re- 
gards them as standing in the radicles of the lymphatic system. 
' Anatomy of the Lymphatic System,' ii. p. 7.] 
3. Adenoid Tissue (Fig. 6). — Adenoid tissue is the name 
given to the delicate substance that forms the framework of the 
lymphatic glands. It consists of networks of fibres forming an 
intricate mesh work, that is filled with the rounded bodies commonly 
known as lymphoid cells. It is exceedingly difficult to analyze 
these tissues, owing to the fact that, with the exception of the 
lymphoid corpuscles, it is often hard to make out anything that 
conveys to the eye the idea of a cell body in the usual sense of the 
term. The best mode of procedure was found to be the following : 
Take a lymphatic gland that is in the early stage of inflammation, 
as an inguinal gland, for instance ; harden it at first in Miiller's 
fluid, and then in alcohol, and make sections through it. On 
viewing such a section with the microscope, it will be seen that it 
is formed of a delicate meshwork containing numbers of lymphoid 
corpuscles {a). By taking such a thin section and agitating it in 
a test-tube with water for a considerable, length of time, and then 
placing it upon a glass slide and brushing it with a camel's-hair 
brush, most of the lymphoid cells will be removed, and the dehcate 
network will be more thoroughly exposed. It will be seen that, at 
certain parts in this meshwork, there are flattened bodies (h) of 
