1820.] Geological Society. ,5^ 



the perinseum unnecessary. In the case described, the subject 

 of which was a boy of about 16 years of age, an incision was 

 made in the direction of the hnea alba, beginning at the pubes, 

 and four inches long, down to the tendon. The hnea alba was 

 then pierced close to the pubes, and divided to the extent of 

 three inches. A silver catheter was now introduced into the 

 bladder, and its point being felt through the wound, in the fun- 

 dus of the bladder, a stilette was forced through it, followed by 

 the end of the catheter. The stilette was then withdrawn, and 

 the opening at the fundus of the bladder enlarged by a probe- 

 pointed bistoury, the catheter was then withdrawn, and the 

 stone extracted. A flexible gum catheter was lastly introduced 

 by which the urine passed off'. 



The wound in the bladder was healed, and the boy passed his 

 urine freely through the urethra in 10 days. The stone extracted 

 was very rough, and above an ounce in weight. 



At this meeting also a paper was read, entitled, " Observa- 

 tions on the Dugong, the Trichechus Dougong of Linnaeus, by 

 MM. Diard and Duvaneil, naturaUsts, employed under the 

 authority of Sir Stamford Raffles." The description of this 

 animal given by these gentlemen very closely resembled that given 

 above by Sir S. Raffles himself, but was more full in some 

 respects. The head was compared to that of a young elephant 

 having its trunk cut off" obliquely from above, a few inches below 

 the forehead. The lips were stated to be muscular, and move- 

 able, and the jaw bones paved with many horny plates. The 

 animal has two stomachs. On the left side of the first is a large 

 gland which appeared to secrete a fluid resembhng the pancrea- 

 tic. This first stomach communicates with a second, half its 

 size, having near its orifice two conical caeca. The lungs are 

 long, and the trachea bifurcated immediately below the laiynx. 

 All the bones of the hand as they exist in man were found under 

 the skin in the pectored oars, although they bore no external 

 appearance to hands. In other particulars, the account given 

 by this gentleman of the structure of this animal coincided with 

 that given above by Sir S. Raffles. 



June 22. — The Society met, but immediately adjourned, on 

 account of the lamented death of their President, the Right Hon. 

 Sir Joseph Banks. 



GEOLOGICAL SOCIETY. 



April 7. — The first part of the observations on the Geology of 

 the Isle of Man, by J. S. Henslow, Esq. M.G.S. was read. 



Granite occurs in much greater abundance in the Isle of Man. 

 than Dr Berger seems to have suspected. In the neighbourhood 

 of the Dun, it is found chiefly in a decomposed state, and in 

 some places passing into gneiss, but in the higher elevations it is 

 perfectly compact. To the south of Fox-dale, it foruis a hill or 

 ridge stretching nearly north and south for about one mile, and 



