lit Mr. Delaval on the Cauje of the 



■were viewed, in the fame manner as the pre- 

 ceding liquors, and were found to yield vivid 

 colours by tranjmijfioni but to rejleSl no colourSf 

 (No. 25.) 



The addition of the alcali muft be very gra- 

 dual : for if too much is added, at once, to the 

 red liquor, the intermediate colours, between 

 the red and the green, will be wanting. To 

 half an ounce of the red infufion, it is proper to 

 add, at once, only the lead quantity of a folu- 

 tion of pearl alh, that can be taken up, upon 

 the point of a pen, repeating this addition, 

 flowly till each of the colours are produced. 



The Rowers, after having been repeatedly 

 macerated in acidulated water, loft their colour- 

 ing matter, and became white. 



Yellow flowers alfo communicated their colours 

 to water, and to fpirit of wine. The infufions 

 and tindures of thefe flowers were fubjeded to 

 the fame experiments, as had been employed in 

 the examination of the liquors already mention- 

 ed, and appeared yellow by tranjmitted light, 

 but did not reflet any colour. (No. 26, 27.) 



White paper, and linen, may be tinged, by 

 dipping them' in the infufions of the flowers of 

 each Colour : and by fpreading, upon thofe white 

 grounds, the exprefied juices of fuch flowers, 

 their colours may be communicated to the paper, 

 and the linen. 



Thefe 



