105 
TAB. CCLIII. 
ARGILLA - ferrifera. 
Ochre. 
Syn. Colorific Earth. Kirw. 1. 194. 
Yellow Earth. Ditto. 
Gelberde. Werner. 
We are often led to seek at a distance natural productions 
which are tobe found near at hand, and perhaps in the greatest 
perfection at home. Thus it happens with some Ochres. 
Mr. Kirwan among his colorific Earths, vol. 1. 193, 194, 
speaks of Yellow Earth; and other authors speak of it also: 
all which nearly agree with our common English Ochre, 
which is equally useful, and is often the best that can be 
procured. Thisis called Stone Ochre,and is used by artists, 
painters in oil chiefly. It is not mentioned as such in ge~ 
neral, except by Sir John Hill, who has said enough of 
Ochres to confound the artists in their choice, particularly 
as he recommends so many. ‘ 
I here show some varieties, both for the curious mine- 
ralogist and the artist. Earths most useful as colours are 
generally most durable *, 
The upper specimen is not fit for that purpose, as it is 
rather of a loose texture, separating in water, scarcely 
smooth, and is rather a half-mixed imperfect Ochre. 
The middle figure approaches nearer to an useful Ochre ; 
but is rather too loose and gritty. It is a variety brought 
me by Lady Hippesley from Somersetshire, where there 
* The Patent Yellow is useful and durable in oil-painting, but in water it 
soon blackens, 
