MINUTE ANATOMY OF THE LYMPHATIC GLANDS. 



331 



ceptible, as in the ox and horse, in both of which the medul- 

 lary substance presents an intensely brown colour. The finer 

 points of structure are best defined and most clearly visible in 

 the ox, and it was therefore very fortunate that His chose the 

 glands of this animal for his investigations. If sections be 

 made from fresh glands, especially with high powers, we usually 

 see only a homogeneous tissue, in which small lymph cor- 



Fig. 60. 



Fig. 60. Vertical section of a lymphatic gland from the Ox. A, cor- 

 tical substance ; B, medullary substance, a, capsule ; a', trabeculae ; 

 b, follicles ; &', follicular cords (medullary cords) ; c, lymph path, 

 designated in the follicles lymph sinus or investing sinus; the fine 

 fibres traversing this are omitted. Preparation macerated in alcohol, 

 and magnified 25 diameters. 



puscles, and indeed successive layers of cells, are arranged so 

 closely that an intermediate substance is only apparent at the 

 very thinnest parts of the sections. For the purpose of demon- 

 strating the different structures, it is expedient in the first 

 instance to harden the glands ; and this can best be accom- 

 plished by maceration in alcohol, after which extremely fine 

 sections must be washed, or still better, gently pencilled out. 

 When this has been done, sections of the medullary substance 

 are found to present a dotted character ; these, however, are 



BB 



