2o8 Mfk Bela'val on the Cauje of the 



By a fimilar treatment, fuftic, and other dying 

 woods, were deprived of their Colouring Matter, 

 and became ivhits. 



I have hitherto fhewn, that the Colouring Mat- 

 ter of plants does not exhibit any colour by re- 

 fleftion, but by tranfmifTion onlyj that their Iblid 

 earthy fubftance is a white matter; and that it is 

 the only part of vegetables, which is endued 

 with a reflective power 3 that the colours of vege- 

 tables are produced by the light reflefled from this 

 white matter,and tranfmitted from thence through 

 the coloured coat, or covering, which is formed 

 on its furface by the colouring particles; that, 

 whenever the colouring matteris either difcharged, 

 or divided, by folution, into particles too minute 

 to exhibit any colour, the folid earthy fubftancc 

 is cxpofed to view, and difplays that whitetiefs^ 



which is its diftinguilhins charadter. 



Animal fubftaiices do not aflford any great va- 

 riety of coloured products. But, in all thofe ani- 

 mal matters, which do exhibit colours, the colour- 

 ing particles are endued with the fame properties, 

 and are regulated by the fame laws, vs'hich pre- 

 vail in vegetable fubftances. 



The tindlures and infufions of cochineal (No. 

 59, 6o.)and of kermes (No. 61,62.) yield their 

 colours, when light is tranfmitted through them, 

 but do not refled any colour. 



The principal animal coloured fubftances are 

 the bile, and the blood, I diluted, with diftilled 



water. 



