THE BLADDER. 83 



angles to the orifices of the ureters and the adjacent part of the 

 bladder. The texture of this muscle is, also, like that of the 

 musculo-fibrous coat of the arteries. When a bladder is recent, 

 this detail of structure is made out with difficulty: it requires 

 to be previously hardened in spirits of wine. That a power 

 exists in the neck of the bladder of retaining completely the 

 urine, has been satisfactorily demonstrated to me in a case of 

 fistula in perineo, which was presented to the notice of the late 

 Dr. Physick and myself, a few years ago.* Occasionally 

 there exists on each side of the neck of the bladder, passing 

 from it to the pubes, a muscle of half an inch in breadth, the 

 effect of which is to draw the neck of the bladder towards the 

 symphysis pubis. This is called by some the muscle of Wilson, 

 when it exists in a distinct state it is evidently the anterior fas- 

 ciculus more detached than usual of the Levator Ani ; but under 

 ordinary circumstances it appears as the anterior margin of 

 that muscle, and therefore does not attract special attention. 



As the urethra of the male performs the double office of con- 

 ducting both semen and urine, it will be described more pro- 

 perly along with the organs of generation. 



The urine has a considerable number of constituents, the 

 proportion of which varies according to age, health, and other 

 circumstances. Water forms about nine-tenths of it, the re- 

 mainder is an animal matter insoluble in alcohol; uric and lac- 

 tic acids; lactate of ammonia; sulphate of potash and of soda; 

 hydrochlorate of soda and of ammonia; phosphate of soda and 

 of lime; and fluate of lime. 



P. S. Since the preceding forms went to press, the author 

 has had the perusal of a paper on the Anatomy and Pathology 

 of the Mucous Membranes, which presents in its anatomy the 

 closest coincidence with his own views expressed in Sect. 3rd, 

 Chap. III. of this volume. This coincidence is the more gratify- 

 ing, as its author,! like the other European authorities who have 

 touched this subject under the same views, does not appear to 



* Chapman's Med. and Phys. Journ. 1824. 



t liechcrches Anatomiqucs sur la Membrane Muqueusc, &c. Par M. Na 

 tails Guillot, L'Experlenco, p. 161, vol. i. Paris, 1837 38. 



