On Sun Pictures. 459 
would compete in finish with the pictures produced by the 
sun in a few minutes. 
The value of the Calotype pictures to the artist, as subjects 
to copy from, is very great. By their aid he is enabled to 
correct his perspective; to carry into his studio the designs 
from which he can work up his drawings to the highest 
degree of finish; to give to each object in his picture its 
exact size and yalue,—as it often happens in drawings that 
more than a proper degree of importance is given to objects 
which in nature are small and insignificant; and lastly, to 
use the calotypes as a study for the correct mode of throwing 
the shadows,—for nature itself, being its own artist, cannot 
err on these points. 
I fear that I have but imperfectly described this most 
interesting process. There is so much to be said upon the 
subject that the difficulty has been to compress my commu- 
nication within the limits ofan ordinary paper. Butifin any 
part of my description I have not made myself sufficiently 
intelligible, it will give me pleasure to assist personally any 
members of the Society who may desire to practise the 
delightful and amusing art. 
