G. O. Sars—Practical use of Autography. 279 
before the lithographer or engraver can copy them, and it is of 
no material difference to the former whether he makes them 
with lead pencil or in the above described manner. The onl 
difference is that he must himself arrange his figures on the 
plates, and not, as otherwise is the practice, leave this to the 
hthographer; and besides, he must draw all the figures that 
are to go on one plate in as far as possible a continuous 
sequence. But this increase of labor is of small account com- 
pared with the great and essential advantages offered by this 
method, viz: 
1. Cheapness.—The expenses of such a plate are reduced 
simply to the cost of paper and printing, and will be even less 
than for a page of common printed matter. Thus any zoolo- 
gist who publishes his researches can illustrate his papers with 
any number of plates, without meeting the insurmountable 
obstacle of enormous expense, which too often has rendered 
illustration of such papers impossible. - 
. Correctness.—It avoids the errors that come from the copy- 
ing of drawings by the engraver. 
has seen, and consequently it is generally necessary that the 
draughtsman should be a zoologist. : : 
me modern zoologists have, to save expense, tried to make 
their drawings direst on the stone. Such a plate will of 
requires unusual practice and a special study of the litho- 
graphic art, which can be e: very 8 
number of zoologists. It is obvious that the same result is ob- 
tained by the above described method, and in a far easier way. 
