of Its dliferent States on Dyeing, 49 



Expeiinient VII. 



Nos. 8 and 9. Mixtures made with eqiial Parts of Clip- 

 pings, the IVool of dead Animals No. 2, and of diseased 

 Sheep No. 3, 



The difference between Nos. 8 and 9 was scarcely per- 

 ceptible ; the colours were dull and dirty, and darker than 

 Nos. 2 and 3, of which they were in part formed. 



Experiment VIII. 



The same numbers of wool employed in the preceding 

 experiments were dyed blue, and their results perfectly 

 agreed with those already stated. This colour is perhaps 

 the only one that wools of an inferior quality take well, 

 though the blue is not equal, and always inclines to black. 



Experiment IX. 



The wools Nos. 1 and 2, which had been scoured, and 

 the scrapings. No. 8, were treated with the dye^ compara- 

 tively with that of No. 1, spun in the grease. The three 

 first took the colour slowly, and assumed a dull blue tint, 

 inclining to black. No. 1 , on the contrary, took it very 

 speedily, and acquired a beautiful and very deep blue colour. 

 These fcfur numbers vyere scoured together, hot, with 

 Flanders soap : the wools of the healthy and dead animals, 

 and the clippings, entirely lost their colour ; while that of 

 No. 1, in the grease, retained a very brilliant barbel blue. 



Experiment X. 



Wools of the three qualities employed in the three manu- 

 factories of tapestry were dyed at the same time with tho 

 Merino wool No. 1. In all the experiments the latter took a 

 deeper colour than any of the others, which are carded wools 

 of Flanders, Holland, and Picardy. 



The principal facts contained in this memoir lead to the 

 following consequences : 



1. In scouring, the heat of the fluid ought never to 

 exceed 60" ; for, even before it rises to the temperature of 

 boiling water, wools in the grease are very liable to be in- 

 jured by the potash. 



2. Wools scouted at two operations can never be ren- 

 dered completely wliite. This effect stems to proceed from 

 a change of state in the greasy colouring matter, which, 

 by becoming njore highly oxygenated, loses its solubility. 



3. Oxygenated muriatic acid, and oxygenated nmriatic 

 acid gas, precipitate, in white Hakes, the animal matter 

 coniamed in the grease: it is speedily coloured by the air, 



\ol. 23. No, 89. 0(7. J 805. D ' and 



