chap. xii.] SIMPLE LYMPHATIC GLANDS. 97 



nucleated protoplasmic cells, which are the concentric 

 bodies of If assail (Fig. 59s). They are met with even 





Fig-. 59A. Section through the Thymus Gland of a Fo3tus. 



a, Fibrous tissue between the follicles ; 6, the cortical portion of the follicles ; 

 c, the medullary portion. 



in the early stages of the life of the thymus, and 

 cannot therefore be connected with the involution of 

 the gland, as maintained by Afanassief, according to 

 whom the concentric cor- 

 puscles are formed in 

 blood-vessels which there- 

 by become obliterated. 

 According to Watney 

 they are concerned in the 



formation of blood-vessels Fig. 59B. Two Concentric or Has- 



and connective tissue. SffiooSS?"" f the Tbymus ' 



The lymphatics of the 



interfollicular septa and trabeculae always contain 

 numbers of lymph corpuscles. The blood capillaries 

 of the follicles are more richly distributed in the 

 H 1 



