E 3 6 ] be faid, that the Spar had fome flinty parts rn its original compofition } for the fame thin<* happened when the natural and the artificial Spar was decompounded } and if there were any filex in its compofition, it would have been precipitated upon the very firft diftillation • whereas we find it happened equally upon the experiment being repeated numbers of times. U alcohol, common oil, i. e. oil of olives, ox oil of vitriol,' were put into the recipient before the operation for decompounding the Sparry Fluor, no flinty cruft was formed, which only hap pened when water was in the recipient. The acid of fpar uniting with the alcohol, had no other effedt than to give it an acid tafte. I 3'*-i5* Spirit of fait and that of nitre, employ ed inftead of oil of vitriol, in the diftillation of Spar, expelled from it the fame acid, which formed likewife the fame kind of cruft (6) with the water in the recipient. It appears from this experiment, that as Becher and Sta H i. both pretend, that oil of vitriol contains a iiliceous or flinty kind of earth, the filex formed here is by no means formed by the pre tended filiceous particles of the oil of vitriol If Spar be diflolved by heat in acid of nitre or muriatic acid, and fpirit of fal ammoniac be adued, a true calcareous earth is precipitated, which effervelccs with all acids-, but if fpiritus jalts ammoniaci cum calce be employed, a fine ipai is precipitated. 1 lie fame tiling happens from fait of tartar, or any fixed alkali, whether mud or cauftic. If acid of vitriol be poured on the fqlution, a gypfum is precipitated, which likewiie happens upon the addition of fal ca- tfsarticum amarum, tartarus vitriolatus, or fal Glauheri. J 17. Acid