STRUCTURES FOUND IN THE CONNECTIVE TISSUE. 187 



thickness in different parts of the circumference. This capsule 

 sent in fibrous trabeculse dividing the cortical portion into 

 alveoli. 



But these trabeculse varied very much in their size and 

 arrangement, being in some places very much thicker than the 

 fibrous capsule itself, while in other places they were mere 

 threads of fibrous connective tissue. They also varied in their 

 distance from one another ; in some places being close together, 

 in others wide apart. 



In the alveoli were masses of round cells resembling large 

 lymph corpuscles. These masses varied very much in size. 

 In many of them were fibrous trabeculse, seen in transverse 

 section, passing through the substance of the mass. 



From this description of the cortical portion it will be seen 

 that there is some resemblance to an ordinary lymphatic gland, 

 but in the medullary portion the resemblance ceases. 



The fibrous trabeculoe in the medullary portion, or that 

 portion of this structure which corresponds to the medullary 

 portion in an ordinary lymphatic gland, are very much thicker 

 than in the periphery, while the masses of cells have the same 

 irregular arrangement as in the periphery. 



This will be seen from the drawing made with a low power 

 (PI. XIV, fig. 4). 



Throughout all parts of this structure the cell masses are 

 separated from the fibrous trabeculse by a well-defined space 

 similar to the lymph space in a lymphatic gland, but no trace 

 of the reticulum occupying this space in the ordinary lym- 

 phatic gland can be seen, A few fibres pass across the space 

 from the trabeculse, but they are very few, and appear to be 

 merely isolated fibres of connective tissue. 



Throughout the whole of the fibrous trabeculse are a very 

 large number of blood-vessels, varying from an artery with a 

 well-defined muscular coat to large capillary vessels. 



The great peculiarity of this structure consists in these 

 blood-vessels opening directly into the spaces between the cell 

 masses and fibrous trabeculse. (See PI. XIV, fig. 5.) 



In all parts these spaces are seen to contain red blood- 



