yialit7ul Hisluiy. ' 3()1 



3. Urinary concretion in a Pipe. — The concretion deposited 

 upon the inside of a waste pipe, in the Glasgow Infirmary, 

 through which urine only has passed for the last twenty years, 

 has been analyzed by Dr. Thomson. It was about an inch in 

 thickness, and rpsembled calcareous tufa. 



25 g! ams yielded Urea, ^-c 1.0 



Albumen and sand . . 1.1 



Phosphate of lime , . 5.8 



Carbonate of lime . . 2.8 



10.7 

 About 4.3 of urea was supposed to be decomposed during 

 the analysis, and the remainder of the loss is attributed to 

 water. 



4. Prize Question. — The Royal Academy of Sciences, at 

 Paris, propose the following subject, to be adjudged in 1821 . m 



" To give a comparative description of the brain in the four 

 classes of vertebral animals, and particularly in reptiles and 

 fishes ; endeavouring thence to recognize the analogy of the dif- 

 ferent parts of this organ, marking with care the changes of 

 form and of proportion they present, and following, as pro- 

 foundly as possible, the roots of the cerebral nerves. 



" It will be sufficient to make the observations on a certain 

 number of genera, chosen in the principal natural families of 

 each class ; but it will be necessary that the principal prepara- 

 tions be represented by drawings, sufficiently detailed, that 

 they may thence be reproduced, and their accuracy deter- 

 mined." 



The premium will be a gold medal, value 3,000 francs, to be 

 appropriated in the public sitting of the month of May, 1821. 

 The time for the transmission of memoirs, written in French 

 or Latin, is January 1, 1821. To be addressed to the Secretary 

 of the Institute. 



5. Medical Prize Question. — The Society of Practical Medi- 

 cine at Paris, propose, as the subject of a prize, consisting of a 

 gold medal, value 200 francs, to be adjudged at the la&t sitting, 

 in the year 1820. tho following f|iiostion : — 



