78 
impression was, that they had been produced by Mr. Swan’s 
process, as it is quite possible to replace the carbon by 
coloured pigments, and imitate the colour of any chalk, 
crayon, or even black lead pencil, in the latter case using 
plumbago. The act of rolling a picture of this kind would 
give it a lustre like a pencil drawing. There are specimens of 
this appearance in the collection. 
Having had occasion to write to Mr. Swan, I requested 
him to give me such information as he possessed as to how 
these copies were produced. The following is an extract 
from his reply : — 
“ To J. B. Dancer. 
“Many thanks for your kind enquiry. Mr. Braun, of 
Dornach, is printing a number of copies of pictures by my 
process, in particular a series of Holbein’s works; and if 
this series form a part of the collection to be exhibited at 
your society’s meeting, they are no doubt by my process. 
Mr. Braun is however also using another process (Rousseau’s) 
for the production of the Louvre pictures, and I think it 
most probable that all the red pictures, except the Holbeins, 
are by this process. I do not know precisely what M. 
Rousseau’s process is, but I have heard that it is a modifica- 
tion of one of the processes of Sir John Herschel. 
“ You are quite right in thinking my process suitable for 
the imitation of old red chalk drawings ; the shades of colour 
can be imitated exactly. 
“ Mr. Braun is now carrying out my process very energetic- 
ally, and has erected a steam engine to drive the tissue 
making machinery. “ J oseph W. Swan.” 
I think, Mr. Chairman, you will agree with me, when 
looking over these copies, that they mark a most important 
advancement in the art of Photography. In these produc- 
tions we have identity in colour as well as in form. 
