^86 Mr. Macie’s Account of 
(D and E). And another portion of this folution mixed with 
marine acid afforded no precipitate, and remained perfectly un- 
affected for two days j but on the third it was converted into 
a firm jelly like that § IX. (F). 
As gypfum is found to melt per fe at the blow-pipe, though 
refraCtory to the ftrongeft heat that can be made in a furnace, 
it was thought that poffibly filiceous and calcareous earths might 
flux together by this means, though they -refift the utmoft 
power of common fires ; but experiment fhewed, that in this* 
refpeCt quartz did not agree with Tabafheer. But this differ- 
ence feems much too likely to depend on the admixture of a 
little foreign matter in the latter body, to admit of its being 
made the grounds for confidering it as a new fubftance, in 
oppofition to fo many more material points in which it agrees 
with filex. 
Nor can much weight be laid on the inferior fpecific gravity 
of a body fo very porous. The infufibility of the mixture 
§ XIII. (G) depended alfo, probably, either on an inaccuracy 
in the proportions of the earths to each other, or on a deficiency 
of heat. 
3. Of the three bamboos which were not fplit before the 
Royal Society I have opened two. The Tabafheer found in 
them agreed entirely in its properties with that of N° I. 
and II. 
It was obferved, that all the Tabafheer in the fame joint was 
exaCtly of the fame appearance. In one joint it was all fimilar 
to the yellowifh fort N° I. I11 another joint of the fame 
bamboo, it refembled the variety (c) of N° It Probably, 
therefore, the parcels from Dr. Russell, containing each feve- 
ral varieties of this fubftance, arofe from the produce of many 
joints having been mixed together. 
4. The 
