Practical Paper Making. a7 
the pulp had answered very well for writing papers; that the 
cobalt blueing was very handsome, giving the same shade 
upon both sides of the leaf, and that in this particular it 
had surpassed the English; that the paper intended for 
colouring presented irregularities in the sizing, so that 
several sheets upon which M. Merimée had spread colours 
were found to be very spotted. In the manufacture of this 
kind of paper alone, MM. Canson are behind the Dutch or 
_ the English. 
COMPARISON OF THE Two METHODs.—We have given 
with all necessary detail, the two methods of sizing in the 
pulp, which are at the present time in competition. We 
have reported, word for word, the opinion of a distinguished 
manufacturer on the process recommended by the commis- 
sion of the “ Société d’ Encouragement,” and the opinion of 
this commission upon the specimens sent by MM. Canson. 
The result of the comparison of these two methods is, that 
they have both been entirely successful, with the exception 
of a few defects in that of M. Canson, which will un- 
doubtedly disappear with increased care in manipulating. 
It, therefore, remains for the intelligent manufacturer to 
choose the method, which experienee may prove to be the 
most advantageous, under the double aspect of cost and 
facility of operation 
Ist. Under the head of cost, we refer to the purchase of 
material. It cannot be denied that the wax employed by M. 
Canson is very much more expensive than resin, and the 
same holds good of potato starch as compared with glue, 
obtained from the parings of saddlers, leather dressers, and 
tanners. Potato starch is undoubtedly lower in price than 
gelatinous size, and sizing with wax costs double what it 
does to employ gelatine. 
2nd. In regard to facility of operation, those necessi- 
tated by the commission’s process are limited to mixing the 
size with the pulp in the vat itself, and making the mixture 
into paper at once ; whereas, to carry out M. Canson’s plan 
the mixture is made in the rag-engine, and has then to be 
transported to the vat before beginning the operation of 
manufacturing the paper. 
3rd. «And lastly, as to the right of putting one or the 
other of these two methods into practice our choice cannot 
be very doubtful. M. Canson required the payment of one 
thousand francs (about 200 dols.) to allow a participation in 
his patent rights ; whereas the “Société d’ Encouragement ” 
has opened the important discovery of its commission to 
WEW SERIES.——VOL. I. BR. E 
