ochres, and other mineral pig- ments, have been tried, but with» out anlivering the purpofes f0 well as could be wifhed. Two compo- fitions like-wile, recommended in the Swedilh Tranlaciions, were examined by our author; but he gives the preference to the follow- ing compoiition : the finell colour- ed pieces ol pitcoal are to be ground to an impalpable powder, and to be added to the melted tar in fuch a proportion as to be freely fpread with the brulh while warnL-The following curious anecdote is re-

. lated by Dr. Lewis.

The mixture of tar and lamp- blaclc is found the moi’: efFectual prefervative for the malls and yards of lhips. Such parts of the mall, as the Hiding up and down of the fails requires to be only gretfed, and tholie which are covered with turpentine or rofin, mixed with tal- low or oil, generally contract large rents, while the parts coated with tar and lamp-black remain perfect- 1y found. I have been favoured, by a gentleman on board a vefiel in the EaitIndies, with an account of a violent thunder-ltorm, by which the main-malt was greatly damaged, and the efleeits of which on the diPEerent parts of the mail were pretty remarkable. All the parts which were grealied, or co- vered with turpentine, were burfi in pieces: thofe above, between, and below the greafed parts, as allio the yard-arms, the round top, or fcaliblding, &c. coated with tar and lamp-black, remained all un- hurt.

* Dr. Lewis met with the firll account of this varnifli, in a


Of amlier

warm/Jar fir Papier JVIarbé, tit. HE cuttings ofwhite or brown _ paper, boiled in water, and beaten in a mortar, till they are reduced into a kind of pallc, and then boiled with s folution of gum- arabic or fize, form the papier ma- c/aé. From this are made agreat variety of toys, tiec. by prefling it while moilt into oiled moulds.—A black varnifh, hard, durable, and glofTy, for coating thele toys, &c. is thus prepared * . Some colophony, or turpentine, boiled down till it becomes black and friable, is melted in a glazed earthen veflel, and thrice as much amber in fine powder fprinkled in by degrees, with the addition of a little ipirit or oil of turpentine now and then ; when the amber is melt- ed, fprinkle in the fame quantity of farcocolla, continuing to iiir them, and to add more fpirit of turpentine, till the whole becomes fluid; then firain out the clear through a coarfe hair-bag, prefiing it gently between hot boards. This varnifh, mixed with ivory-black in fine powder, is applied in a hot room, on the dried paper-pafle, which is then fet in a gentle heat-

ed oven, next day in a hotter oven, .

and the third day in a very hot one, and let {land each time till the oven is grown cold. The palle

thus varnilhed, bears liquors hot or cold.

A more fimple amber varnilh is prepared, by gently melting the

pamphlet on

Drawings, &c. printed for Mr. Peele, in 1732, and faid to be taken chiefly from

manulcripts left by Mt‘. Boyle.