109 
TAB. CCLVI. 
Havine figured the Yellow as well as Red Earths, ani 
‘mixtures of Iron with Clay, &c., commonly called Ochres, 
I venture to consider it as not very irregular, being in some 
degree natural, to exhibit the following varieties. These 
may, from their texture and nature, arrange with or near 
the former, and so complete the list of colours, as they 
altogether seem to be mostly regarded in that light; and it 
may serve as an example for the order of other substances. 
when they have any thing to do with colours, as to ar- 
rangement.—Thus I would place the lightest first, and as 
regularly as I could, the primitives, and then those derived 
from them. TI have, in fab. 10, considered the light blue 
Iron Ore, merely as such, as it has little or no Earth but 
what may be considered as adventitious; and it might 
claim a place hereabouts, from its resemblance to a loose 
Ochre, and may seem necessary to help the purples on this 
plate. As purples *, dark browns, and nearly blacks, have 
scarcely yet been ee this may become instructive, as 
it is curious and natural. Whether the purples depend 
upon the same mixture as in the Clay—/ower jig. tab. 259— 
I do not know. 
The upper figured specomen came from the Isle of Wight ; 
I was favoured with it by my botanical friend C. Lyell, Esqi. 
and I have some from Wales nearly of the same tint, by 
favour of Lady Wilson. The darker ones I have received 
from various persons and places ; and as they are really in- 
teresting, I shall be the more particular concerning them. 
* Iron is understood to have but two sorts of Oxides, the black, or 
martial Ethiops, and the red, any other colour or tint fe produced by 
a particular mixture. 
