New Publication. 1 79 



generally known by peculiar proper denominations 5 for 

 inftance, cinnabar, furely a more convenient name than 

 the drawling new name fulphurated red oxyd of mercury ; 

 and in the next place they mould confider that chemi- 

 cal compounds being artificial productions may contain 

 only thole ingredients which their compound names im- 

 port. But minerals whofe principal compofition is ana- 

 logous, often contain other fubftances alfo, which the new 

 chemical name would not exprefs, and would thus lead 

 to important mi flakes. Thus, for inflance, phofphorite is 

 commonly contaminated with filex, aerated lime, muriated 

 lime and iron, and fometimes with manganefe and fluor; 

 whereas the analogous chemical compound on which the 

 name phofphorated lime is properly impofed, is free from 

 fuch contaminations. Subrtances, therefore, fo different, 

 fhould certainly be dJftinguifhed by different names, or at 

 leaft the word natural or native muft be tacked to the name 

 of the chemical compound; and though, with refpect to fof- 

 file metallic chemical compounds, this inconvenience may 

 often be avoided bv the addition of the word ore, yet here 

 alfo the antient name often exprefies fome other inherent 

 property ; thus the term vitreous added to filver ore denotes 

 not only the compofition, but alfo the eafy fufibility of that 

 particular ore. 



[To be continued.] 



NEW PUBLICATION. 



New Ohfervations concernmg the Colours of thin tranfparent 

 Bodies, /bowing thofe Phenomena to be Infections of 

 Light, &c. Cadell and Davies, Strand, 1800. 



X HESE Ohfervations are by the author of two treatifes 

 on the Origin of the Diverfty of Colours in the Rays of 

 Light, and on the many-coloured Corona occafionally ap- 

 pearing round the Sun and Moon; of which the leading 

 principles have been Mated in former Numbers of the Philo- 

 fqphicaJ Magazine. 



A a 2 The 



