BOOK
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“ ralized with argillaceous earth and muriatick acid. Only nine
, « fpecies of iron* are enumerated in this work;' one of which,
“ he fays,-contains a new metal. This has fince been further
“ inveftigated, exalted in fa£t to the rank of a metal, and
“ moft- aptly named Jtderum. The mifpickel o f authors i*s
“ reinoved.from the arfenick ores to thé iron, and defcribed.
under the name offerrum nativum arfenico adunatum. Hè
“ tells us, that he never faw native tin ; and doubts its exift-
“ iftence. Two new fpecies from Siberia are mentioned in
“ the preface, under the name of Jlannum Julpburat'um.
s “ Bifmuth and nickel Band nearly as they do in Cronftedt,
m except that Bergman does not notice the nickel o f Cron-
“ ftedt, which is faid to be mineralized by the vitriolick acid*.
« The fpecies of arfenick and cobalt remain nearly the fame
“ in profeflor Bergman's arrangement, that o f Cron-
“ ftedt. T h e profeflor feems-to think that the analyfft of
“ arfenick leads further into the true nature o f metallick fub-
“ ftances than that o f any other metal; fince, from arfenick;
“ not only the redundant quantity o f phlogifton is capable of
“ being extricated, fo as to leave it in a cafciform ftate, as in
“ other metals ; but, by further management,, it can alfo be
« deprived of the remaining portion, and its peculiar acid
“ thus developed. If art ihould ever be able; to deftroy in
« other metals, as in this, thatftrong cohefibn which fubfifls
“ between the phlogifton and the acid, it muft, as he ob-
“ ferves, very greatly improve our knowledge of mineral
“ fubftances. In treating of; zinc, he introduces a curious
“ kind, communicated by M. Born,, which he calls zincutn
“ aeratum Jiliceo mixtum. Of antimony only three- fpecies
' * I n 1 78 2 ,was publiihed b ySwen oR inmari, th e refulfr o f fo r ty ye ars bbfervations. A
d ire f to r o f th e iron man ufafteriss ; a mo il tranflation ■ o f this w o rk cou ld not fail oi
able* tre atife, “ Fo erfo ek till Jsernets h if- b ein g h igh ly u ie fu l'to the E n g liih naturaliit
“ toria,” o r E fla y on th e H iilo ry o f Iron , and manufacturer.
' . •. t( are
M are enumerated. Manganejium, or mangeriefe, which, in c h a p .
“ the works o f Cronftedt and Wallerius, is placed among the - . ' -
“ earths, having, been reduced to a reguline ftate,.is nowq for
.“ the firit time, brought into the metallick clafs, and occu-
“ pies the laft. place. The author makes- two fpecies a cal-
•“ ciform, and another which is mineralized by the aerial.
■“ acid.
“ The manganeftum, and the. new metal fince c a lle d ^
“ derum, are not the. only new metals mentioned in this
“ fketch.. He gives-us, in the 32.d fecftion,. feveral reafons
“ which induced to think that the acid o f Molybdena was of
“ metallick origin ; and relates, that in confequence of his
“ directions, M. Hielm has obtained a regulus from that fub-
ftaace ; though, at the publication of this work, it had not
“ been fufficiently examined;
“ It is even fufpedled by the author, that his terra ponde-
“ rofa m in reality a new metal: forthpre is great fimilarity
between this earth and the calx o f lead, and he has lately
“ difcovered a method' of precipitating it by means o f the
“ phlogifticated. alkali. Neverthelefs,,not having hitherto
“ been able to reduce it to a reguline ftate, it muft remain
“ among the earths.
“ Although in fyftems of'mineralogy founded entirely on
“ chymieal characters,, ftones, and petrefactions, have no
“ place in the body of the fyftem, yet profeflor Berg-
“ map does not mean to exclude a due attention to them;
“ the knowledge of the former being o f the utmoft impor-
“ tance in the arts o f life ; and that o f petrefa£lions leading,
“ perhaps, finally to explain more intimately, not only the
“ nature of the containing fubftances, but the internal con-
“ ftitution of the globe. Hence, he has, in the manner of
“ Wallerius and Cronftedt, put them at. the end o f this work,
' 6 «> an(j