338 ANIMAL REPRODUCTIONS. 
© made a longitudinal incifion between the four 
© horns in the head of other fnails : nature em- 
© ployed above a month in uniting the parts, and 
* the animals were very languid. ‘Thefe experi- 
“ ments were repeated, 1769, and all unfuccefsful- 
‘ly. Many perfons have informed me, from dif- 
¢ ferent countries, that their eflays have been ex- 
¢adtly fimilar to mine.’ 
It is fingular that I have fucceeded with oh 
a dozen of {nails, while M. de Bomare has failed 
with more than fifty, and M. Adanfon with above 
fourteen hundred. But it is pofible that thefe 
gentlemen were too earneft to believe that their 
experiments had failed ; or they did not pay fuf- 
ficient attention to the progrefs of the regenera- 
tion, always more or lefs tardy, more or lefs dif- 
guifed, and, confequently, more or lefs difficult 
to be recognifed. 
I have named another valuable naturalift, F. 
Cotte, curate of Montmorency, who has been 
equally unfortunate as M. Adanfon and Bomare. . 
His unfuccefsful experiments are related in a let- 
ter to the Abbé Rozier, which was publifhed in 
the-Yournal de Phyfique, May 1774. The repro- 
ductions of heads are according to him imaginary. — 
Becaufe he decapitated a great number of {nails 
from any we Bde and almoft the whole died 
iki oe a yi knife, not by drawing ee 
ry 
