3* On Dyeing Cotton >with the 



fitrprifing that extraordinary quantities of muriatic, acid 

 fliotild be required to retain a veryfniall quantity of oxygen. 



To obviate the lofs of the oxygen, and prevent the necef- 

 fily of ufing fo much fait, the alembic and great receiving 

 vat, or vats, fhould always communicate immediately toge- 

 ther, without the intervention of condcnfers, which always 

 tend to diminifli the capability of the muriatic acid to unite 

 with and retain the oxygen in the water, and thus defeat the 

 objoA of the procefs. Abforption might be guarded againft 

 by having the communicating tube bent, liRe a double fy- 

 phon (IS), and in the lower angle to have an air-tight ftop- 

 ]>er, that would yield on the firft prefTure, fo that no water 

 could ever reach the alembic. It ought to be remembered 

 too, that if by negleft abforption ever takes place, the liquor 

 will be rendered alniofl totally inert, even with the bcft con- 

 denfers. Various other modes of anti-abforption might be 

 adapted equally efficient with thofe in ufe, and without their 

 inconveniences. 



When citizen Paul thinks proj^er to publifli his mode of 

 impregnating water with oxygen, perhaps a (lill more fpeedy. 

 and efiecluai method of difcharoino; the colourinsr matter of 

 cotton and linen may be found ; and the theory or procefs of 

 eombuftion, adapted by Berthollet in his " Elements of the 

 Art of Dyeing," and ably combated by Dr. Bancroft* in 

 bis moft ingenious " Refearches in the Philofophy of per- 

 manent Colours," be fuperfeded by the more limple term 

 folution. J. A. B. 



Tokeiihoufe-vard, 

 - Sept. 9, ifiGi. 



X. Experiments on Dyeing Cotton with the Flowers of the 

 Cartbamus Ti7itloritis (Safflowcr). By ProfeJJor Beck- 

 . MANf. 



Jtx BOUT feven years ago, I made various experiments on 

 dyeing wool with the flowers of the cartbamus ; and two 

 years after I added fome experiments on dyeing linen in the 

 fame manner :J:. As thefe were approved by men well verfed 

 in that part of cbemiftry which relates to the art of dyeing, 



* May it be permitted to a(k this philofopher, through the medium of 

 the Philofophical Magazine, when the world will be tavoured with his 

 promifed fccond voiume of Refearches ? 



f From the TraiifaSlions of the Royal Society at GStt'iu^en for the Year 

 1780. 



i Novi Comment <r, Societ. Gtittin. iv. p.Sg.and vi. p. 79. 



6 i refolvpd 



