-j'S Difcription of a Thrfc without Half. 



trace, which undulated at the furface of the fait. But this 

 effect is doubtful : when projected on ignited iron, it retained 

 a light fcarctly fcnfible. 



hi the lad place, I fubjeefed to diftillation, at a red heat, 

 in a luted glafs retort, one gramme and a half (23*16 grains) 

 of this lubltuncc. I obtained fome drops of ajiquid tranf- 

 parent as water, and a quantity of air which did not exceed 

 the capacity of the veifelfl tiled for cliftilling. This air con- 

 tained one or two hundredths of carbonic acid gas; a quan- 

 tity inferior to what. J expected to obtain by the decompofi- 

 tion of water and the inflammable matter contained in the 

 clay. The carbonic acid gas, naturally belonging to the air 

 of the yeffela anterior to the diftillation, mult be deducted 

 from the eltiniation I have given. 



XII. I thall recapitulate, in a few words, the principal 

 reful ts of thefe observations : 



lit, Aluminc does not form with carbonic acid a concrete 

 carbonate of alumine; or, at leafr, no one has been able to 

 form that combination. \ 



2d, The fubttanee, hitherto confidered as artificial concrete 

 carbonate of alumine, is the remit of the union of alumine with 

 alkali and carbonic acid. This acid docs not, probably, enter 

 into this combination but by its affinity for the alkali. 



3d, Alumine does not feem to unite with carbonic acid 

 but in the cafe when the latter is diilblved in water; when 

 this earth precipitates itl'elf from this folution by the volati- 

 lization of the carbonic acid, it does not appear in the Hate 

 of carbonate. 



4th, Native clays, confidered by fome authors as carbonates 

 of alumine, did not appear to me to be in that (late. 



5th, The native argil of Hales, precipitated from its folu- 

 tions in nitric acid by carbonate of ammonia in excefs, leaves 

 in folution in the latter fait, a fublianceor combination which, 

 deferves further examination. 



[To be continued.] 



V. Defcripthn of a Hor/'e without Hair, By C. Dr 



La stev 11 1 1:, Member of the Vh'ilomat'ic Society *. ' 



JL HE firft men who obferved nature, ftruck with the 



wonders which it continually prefented to their minds, fell 



into the marvellous, becaufe they were as yet unacquainted 



with its laws, its means, and its powers. Such is the origin 



* loom t)\c Journal chPbvJiqnt, Floreal, an. 9- 



of 



