424 THE SOLIDS. 



tendency to the triangular ; and the colour, although dif- 

 fering in different glands, depends upon their size and age, 

 the younger and smaller being transparent and almost free 

 from colour, the older and larger being of a deep orange or 

 ochre tint. (Plate LVII. jftyb &.) 



The prostatic calculi have been noticed by several ob- 

 servers ; by Cruveilhier, Dr. Jones, Mr. Quekett, Mr. Adams, 

 of the London Hospital, Dr. Letheby, and myself. 



Dr. Jones* describes them as originating in oval or rounded 

 nucleated and organic vesicles, which enlarge and then have 

 their amorphous contents arranged into concentric Iamina3. 

 Dr. Letheby believes that " they are concretions which arise 

 exactly like those of the kidney and bladder, viz., by a suc- 

 cession of external deposits ; " this view is most probably the 

 correct one. 



Dr. Letheby has favoured me with the following observa- 

 tions on the chemistry of these bodies : " You will find," he 

 says | 3 " that they consist of phosphate of lime, which is 

 mixed up with a large quantity of nucleated fat cells and 

 inspissated mucus ; the whole being generally tinted with 

 some shade of yellow or red." 



" They are slowly soluble in strong acetic and muriatic 

 acids; more quickly when heated, and they then leave nu- 

 merous fat globules and remnants of cells. They are not dis- 

 solved by potash or strong ammonia. Heated before the 

 blow-pipe, they char and leave a small residue of earthy 

 matter." 



The smaller calculi resemble closely the concentric corpus- 

 cles or bodies described by Mr. Gulliver as occurring in fibrin- 

 ous clots, and many of them do not present concentric lamella. 



TUBULAK GLANDS. 



SUDORIFEROUS GLANDS. 



The sudoriferous are the most numerous class of glands 

 in the body, their apertures thickly studding the entire ex- 



* Medical Gazette, 1847. f In litt. 



