SYSTEMATIC SYNTHESIS OF TISSUES INTO ORGANS. 373 



various parts of the body, particularly in the neck and 

 groin, where, when they are swollen and hard, they are 

 easily felt. 



1163. THE LYMPHATIC GLANDS ARE CONSTRUCTED 

 of an external coat of sinewy tissue, also woven through 

 the gland so as to leave numerous passages, a kind of 

 network, lined with basement membrane and cells, that 

 grow, loosen, and float off to form the white blood-cells, 

 from the nuclei of which the red ones are developed. 



1164. THE PASSAGES OF THE GLANDS communicate 

 with or open from or into lymphatic tubes, through 

 which lymph is received and removed, modified by 

 cellular action. 



1165. THE GLANDS ARE ALSO CONSTRUCTED of capil- 

 laries and nerves; by the former Blood is circulated 

 through, and by the latter nervous influence exerted 

 upon, the glands. 



1166. Remark. It is evident that the cellular action of the gland 

 may be influenced by the Blood it receives ; and it may be that a part 

 of the lymph is taken up by the capillaries. 



1167. Remark. It is not possible to calculate the size of a gland 

 that would be formed by the Lymphatic glands if amassed in one organ, 

 but it would weigh several pounds. Hence these glands are distributed 

 where there is room for them, where their office will be best performed, 

 and without disfiguring any member. 



Spleen. 



1168. THE SPLEEN is a purple-brown, mottled gland, 

 four to five inches long by three to four broad and one 

 to two thick, shaped like half an egg cut lengthwise, 

 the inner surface, however, being slightly concave. 



1169. THE POSITION OF THE SPLEEN is in the left 

 side, the outer or convex surface, shown by Fig. 251, 

 being in contact with the walls of the trunk, and the 

 opposite concave surface, Fig. 112, being in contact with 

 the stomach and pancreas. It is attached to the dia- 



1163. How ? 1164. What said of ? 1165. How -? 1166. Effect of Blood 

 on gland? 1167. Size of glands amassed? 1168. Describe . 1169. What is ? 



