Royal Society of London. l8l 



fcomes in contact. He has made feveral ingenious experi- 

 ments, which are in this treatife related in detail, and of 

 which the common refult feems forcibly to fuggeft the con- 

 clufion which he thinks that he has eftablifbed. Much of 

 the treatife is employed in pointing out the errors as to fact, 

 and the fallacies of induction, which appear in the explana- 

 tions by Sir Ifaac Newton, concerning this part of the fcience 

 of optics. 



To fay the truth, we find the facts and reafonings in this 

 eflay fomewhat lefs fatisfa&ory than thofe in i}$ author's two 

 former effays. It is probably the true principle which he 

 has difcovered : but he does not, in this inftance, fee it 

 clearly ; he only gropes at it, as it were, in the dark. Per- 

 haps, however, not the author, but the dullnefs or impatience 

 of the reviewer, may here be chiefly in blame. 



INTELLIGENCE, 



AND 



MISCELLANEOUS ARTICLES. 



O, 



LEARNED SOCIETIES. 



ROYAL SOCIETY OF LONDON. 



N Thurfday, Nov. 6", this learned and ufeful body held 

 their firft fitting fince the long vacation, when the commence- 

 ment of Dr. Hcrfchei's Second Part of his Inquiry refpecting 

 Heat and Light was read. 



On the 13th the Society occupied itfelf in reading the con- 

 dition of Dr. HerfchePs paper, which contains a detail of a 

 number of molt interefting experiments relative to the dif- 

 ferent quantities of heat and light tranfmitted through various 

 fubftances and through different coloured glaffes. From 

 Dr. Herfchel's experiments it appears that red glafs allows 

 mod heat and lead light to pafs through. One experiment 



