After the same manner also are made tests _viz._ by the help of the like kind of moulds, which must not be long but plain like shells as appears by the annexed Figure, _A._ and _B._ Not only tests but also cuples are made by the help of these moulds. [_See the fifth and sixth Figures._] Now tests are made more easily this way then crucibles, because the earth only is weighed, and being handled with the hands is put into the counter-mould, which then you must with the upper-part press hard; that it may be made conformable to the mould, _viz._ plain, not long, that which may easily therefore be made; and for this cause those crucibles are easily again taken out, _viz._ if the mould be turned, or the counter-mould be a little knocked against the sides of the form. And if the earth be beaten in too fast that it goes out at the sides, you must cut it off with a knife, or else the crucible, or test is hardly taken out, sticking to the brims, which practise will teach thee. For all things cannot be so accurately demonstrated by a pen. And take this for a caution, that thou do not make thy tests and crucibles of earth that is too soft, but of that which is half dry, otherwise they are hardly taken out of the moulds; for that is more easily and rightly applyed to the mould. And if thou proceed rightly according to the prescript, scarce one crucible of a hundred will be lost. This also is to be observed, that the superfluous earth which is cut off must not be mixed again with the mass for crucibles, because it is spoyled with the fat, or oyl that is smeared over the moulds, and therefore cannot be so well mixed again, and being burnt cleaves, for which cause bad crucibles are made. Wherefore it is to be kept apart for mending of furnaces that are spoiled with an extraordinary heat of the Fire; or for covers of crucibles that are to be made by the help of the hands only, or of moulds, which we cannot want, if we would work all things exactly.