the Analyses of M. Klaproth. 309 



acquired a thick consistence, produced in it no alteration. 

 It retained the same characters of elasticity, consistence, 

 and colour. 



Exp. II. Tsl, Klaproth kindled one part of elastic resin, 

 and made it burn till it dissolved into black drops. In this 

 state the fossil had not entirely lost its elasticity. It was 

 still of a pitchy and clammy nature, and could be drawn 

 out into threads between the fingers. This imperfect com- 

 bustion, however, rendered it soluble in oils, and particu^ 

 larly in that of petroleum, to which it communicated a 

 black colour. 



Exp. III. Two hundred grains of pure elastic resin, 

 placed on a sand bath in a small glass retort, communi- 

 cating with a pneumatic mercurial apparatus, gave by di- 

 stillation, which required a pretty strong and well-main-? 

 tained fire, the following products : 



1st, Eighty-four cubic mchesofgas, which had a fetid 

 odour of garlic. This gas, agitated in Water, lost eight 

 cubic inches of carbonic acid, which precipitated lime-wa- 

 ter, and the remaining 76 cubic inches of carbonated hy- 

 drogen gas burned with a brilliant flame. 



2d, One hundred eighty-six grains of a brown fluid oil 

 of a disagreeable odour. 



3d, Three grains only of a slightly acidulous water : the^ 

 small quantity of this acid did not permit M. Klaproth to 

 examine the natvire of it, 



4th, The porous carbonaceous residuum, which had a 

 somewhat metallic splendour, weighed 24 grains. 



5th, When calcined in a capsule, it left 13 grains of 

 reddish brown ashes, which, when moistened with a little 

 water, gave a red tint to blue turnsole paper, which in all 

 probability was owing to the caustic lime it contained. 

 When put to digest in muriatic acid there remained 

 A\ grains of a light gray earth, mixed with a little char- 

 coal, which, by calc"ination, was reduced to three grains 

 of pure silex. The sum total of tlie charcoal consumed, 

 amounted, therefore, to 12^- grains, 



6th, The muriatic solution, concentrated by evaporation, 

 and edulcorated wilh alcohol, deposited a grain of crystal- 

 lized sulphate of lime. When diluted wilh a larger quan- 

 tity of water, it gave by solution of succinate of anmionia, 

 a reddish precipitate, which, by calcination, was reduced 

 to H oxide of iron. The remaining solution, neutralized by 

 that of caustic ammonia, deposited by the addition of car- 

 bonate of ammonia half a grain of aluniine, and 7-| grains 

 of carbonate of lime, equivalent to 4 grains of caustic lun;;. 

 U 3 A hundred 



