EXCRETION. 69 



The red corpuscles are here disintegrated, after having fulfilled their 

 function in the blood ; the splenic venous blood containing relatively a 

 small quantity. 



The white corpuscles appear to be increased in number, the blood of the 

 splenic vein containing an unusually large proportion. 



The spleen serves also as a reservoir for blood when the portal circula- 

 tion becomes obstructed. 



The nervous system controls the enlargement of the spleen ; division of 

 the nerve produces dilatation of the vessels, stimulation contracts them. 



The Supra-renal Capsules are triangular, flattened bodies, situated 

 above the kidney. They are invested by a fibrous capsule sending in 

 trabeculse, forming the framework. The glandular tissue is composed of 

 two portions, a cortical and medullary. The cortical being made up of 

 small cylinders lined by cells and containing an opaque mass, nuclei and 

 granular matter. The medullary consists of a fibrous network containing 

 in the alveoli nucleated protoplasm. 



The Thyroid gland consists of a fibrous stroma, containing ovoid 

 closed sacs, measuring on the average -fa of an inch, formed of a delicate 

 membrane lined by cells ; the contents of the sacs consist of yellowish 

 albuminous fluid. 



The Thymus gland is most developed in early life and almost disap- 

 pears in the adult. It is divided by processes of fibrous tissue into lobules, 

 and these again into follicles which contain lymphoid corpuscles. 



The functions vi the vascular glands appear to be the more complete 

 elaboration of the blood necessary for proper nutrition; they are most 

 highly developed during infancy and embryonic life, when growth and 

 development are most active. 



EXCRETION. 



The Principal Excrementitious Fluids discharged from the body 

 are the urine, perspiration and bile ; they hold in solution principles of 

 waste which are generated during the activity of the nutritive process, and 

 are the ultimate forms to which the organic constituents are reduced in the 

 body. They also contain inorganic salts. 



The Urinary Apparatus consists of the kidneys, ureters and bladder. 



