Nbl'ice^ respecting New Eochy. 4G1 



far <is ianguage will admit, the most appropriate species of thjie 

 fi;r every individual sentiment ; execute those passages for his 

 own improvement, and impart their genius. to the intended ora- 

 tor. But vvliere is such a master to be found ? View him in 

 perfection — a Chatham and a Handel are his portrait. 

 [To be continued*.] 



LXXXI. Notices respecting New Books. 



On the Safety-lamp for Coal Miners ; with some Researches on 

 Fiame. By Sir Humphry Davy. Svo. p.p. 145. 



X HE design of the present work is to e.xhibit in a connected 

 form, an account of all the researches that Sir HumphryDavy has 

 made *' on the subject of explosions from infiammable air, aiid 

 the modes in which they may be prevented, as well as the col- 

 1-dteral investigations to which thev have given rise, with the 

 hope of presenting a permanent record on this impoitant sub- 

 ject to the practical miner, and of enabling the h'iends of hu- 

 manity to estimate and apply these resources of science, by which 

 a great and permanently existing evil may be subdued." 



The contents of the body of this work have of course been 

 already before the public in different shapes, and any recapitula- 

 tion of them is particularly unnecessary to our readers, to whom 

 the greater part have been progressively communicated through 

 the medium of the Philosophical Magazine as soon as they ap- 

 peared. 



The following brief Appendix is new. 



" Since the Researches upon Flame contained in the forego- 

 ing pages have been published, M. Gay-Lussac has put into my 

 hands a paper written some years ago by M. de Humboldt and 

 himself, which contains some very interesting results, that may 

 be adduced as confirmati( ns of my principles, on the causes of 

 combustion and explosion. 



" MM. Gaj-Lussac and de Humboldt have shown that when 

 oxvgen and hvdrogen are mixed in proportions in which they 

 cannot be fired by the electrical spark, they may be still made 



r* There appeared in this M;ujazine for April, a letter signed " Untiif," 

 referring me to his " Pocket Comp'iMOn' for an illustration of the first prin- 

 ciples of music. I h-ive not scon this " Companion;" hut from Unus's o.vn 

 doicriptioa of the work, I fear that it will not realise his expectation. /J«- 

 tueau and Tartiui are hy far the most able advocates of our present har- 

 mony ; and Ilnussaau must be acknowledged its still more able opponent. 

 See his "Musical Diclioiiary' >7wy, (iirlicle "Harmony,'; not the poit'inl. 

 and luulei.d'tnc; erlracU, « hich have been given us from time to time in 

 iiiod'.-rn publication >.] 



tu 



