214- Analysis of several [Skpt. 



it has ceased, acetic acid is formed. This leads to the suspicion 

 th it the aci tic acid has been formed at the expense of the tartaric. 



Galipot, i :eording to our author, is composed of a volatile oil 

 and a resin According to other authors galipot is nothing else 

 than a very impure specimeu of the resin called elemi. 



Analysis of Rocou. — The rocou of commerce is a substance 

 already altered by fermentation. The author procured grains of it 

 from which he obtained, the following result : — Kocou contains an 

 aroma, an acid, resin combined with the colouring matter, vege- 

 table mucilage, fibrin, coloured extractive, and a peculiar matter 

 which approaches to mucilage and extractive. This analysis explains 

 the reason why an alkali is adde 1 to rocou when it is employed in 

 dyeing. The alkali combines with the resin, and forms a soap 

 which dis^olv. 1 * in water. The alkali acts likewise on the colouring 

 matter, and ren !ei it more lively. 



The second section of Dr. John's work contains observations on 

 diabetic urin ". Though neither urea nor gelatine are to be found in 

 d'abeic urine it notwithstanding contains azote. Diabetic urine 

 i- . :i posed of sugar, animal gum, urate of potash, sulphate of 

 pota-h, mur ate of soda and ammonia, phosphate of magnesia, and 

 phos-phate of iron. 



Some experiments on the excrements of butterflies leads the 

 author to suspect that they contain uric acid. 



The third section contains the analysis of some minerals. The 

 agalmatholite of China (the bildstein of Werner) of a wax yellow 

 colour is composed of 



Silica 55 



Alumina 30 



Lime 175 



Oxide of iron 1 



manganese Trace 



Potash G-25 



Water 5*5 



99*50 



* 



The red agalmatholite of China was composed of 



Silica 51*50 



Alumina 32*50 



Lime 3*00 



Oxide of iron >. . 1*75 



manganese 1 '20 



Potash 6 Q0 



Water 513 



loros 



The new mineral from the North called gahrouite is composed of 



