Jvurney to the Sumynit of the Peak of Tencrijfe. 31 



which has a disagreeable odour. It is followed by au asto- 

 nishing quantity of very good distilled vinegar. 



Buck-thorn. 



The juice of buck-thorn, which contains a bitternauseous 

 extract, gum, and a little sugar, is thickened by a greenish 

 dirty matter, which is separated from it by heating it and 

 leaving it to ferment. This pulp when well washed is of a 

 bright green colour : it is gluten mixed with a little febrine 

 matter: it gives carbonate of ammonia, &c. 



Rose. 



Its petals triturated furnish fine fecula slightly coloured, 

 which gives the same products as gluten. 



Grapes. 



, Fecula is found in great aljundance in grapes : it forms 

 the lees in wine : but to speak of this product would 

 be anticipating what I have to say on fermentation. 

 Gluten is found also in quinces, apples, and no doubt ia 

 other fruits ; it is found in the acorn, chestnut, horse-chest- 

 nut, rice, barley, rye, pease and beans of all kinds. I 

 shall resume the subject hereafter, on the difference between 

 wheat which has germinated and that which has not under- 

 gone this operation. 



IV. Account of a Journey to the Summit of the Peak of 

 Tenerijfe : in a Letter from L. Cordier, Engineer of 

 Mines, to C. Devilliers junior *. 



Santa-Cruz, in TcnsrifTc, 

 MY DEAR FRIEND, May i, 1803. 



X HAVE terminated my seventh geological campaign by a 

 most interesting excursion. I had examined, with Neer- 

 gard, the extinguished volcanoes in the centre of France. 

 In the Pyrenees and Catalonia we discovered the immense 

 remains of the antient strata of the globe, and the mannef 

 in which they have been covered by modern strata, which 

 contain vestiges of an antique organization having no re- 

 semblance to that of the present age. I followed these ob- 

 servations in the interior of Spain, in the Sierra-Morcna, as 

 far as the famous Strait of Gibraltar, where my conjectures 

 on the forces which determined the ultimate form of the 

 continents received a new degree of probability. I had met 



* From the Journal de P-iysi^ue, Messidor, an. 11. 



with 



