Notices reJfeBing new "Eooiks. 175 



danger of fnolUng the colours by foap and alkaline carbo- 

 nates, when the niatidering, inftead of being diiefted with 

 a moderate heat, has been carried to ebullition, as is prac- 

 tifcd in nianv dvc-houics ; but, in this cafe, the colours; ob- 

 tained arc more difficult to be cleared. 



As water charged with oxygenated muriatic acid eafily 

 carries awav the colouring parts of madder, as well as other 

 vegetable and animal iubftances, by decompofing them; and 

 as acids more concentrated may, in their turn, take from the 

 ItuHs the colourlefo alutnine and the oxide of iron,, i'. is iui- 

 poflible for me t(> adopt tlae idea of a chftnical combinatioa 

 of the colouring parts with alumine and metallic oxides, 

 which, in my opinion, when fixed and coloured on any fluff, 

 form onlv compound aooreoates. 



The clearing of objects printed on a white ground requires 

 modiUcations, which I (hall detail on a future occafion, wheii 



I ^iW'X leifure. It will therefore be fufiicient at prelent to 



II lie, thai after continuing for fome time my experiments oil 

 the Turkey red, inferted in the Annalcs de Cbim'ie for the 

 year 1792. I at lafi found a red much more beautiful and 

 durable than that of the f^evant, by fixing alumine on cotton, 

 thread, and linen, bv an alkaline folulion of t'lis earth mixed 

 with liufeed oil. The following is the procefs I employed- 



[To be continued.] 



XXXIII. Notices reJpeEling Neiv Books, 



Au^fiihrViche Gefchichte der Theoretlfcb Praht'ifchen Ubrmacher- 

 k7irij},^c. A Miftorv of Clock- and Watch-making, both 

 Theoretical and I'raftical, fince the earliefl Method of di- 

 viding the Day to the \\w\ of the 18th Century. By I. H. 

 Mouiz Foi'i'E, 1801. 8vo. 564. p. 8. 



X HE autlior of this work having pnbliflicd, in 1797, An 

 Effay towards a Ilidory ol the Origin and Proijirefs oi' Clock- 

 and Wafch-ni-jkinir, confillingof fix (beets; it met with fuch 

 a favourable reccpliou, that he was induced to improve and 

 enlarge it to its prefent fize. Mc acknowledges the obligations 

 lie is under to protellors Kaftner and Beckmann, who aflilted 

 him with their advice and information; and who, on account 

 C)f their learning and cxlenfi'c reading, were able to fupply 

 him with much ufrful intormalion. The whole work i> di- 

 vided iuiotcn chapt'TS. 



F. Theoldfjl victL 'jd of dividing the day, and the invention 

 cfj'un- diali .»^ThL- [)eiiod wlicn fun-dia^s \s«re invented is as 



little 



