244 ANIMAL REPRODUCTIONS. 
tadpoles. Befides, on confulting the authors: 
that have treated of animal reproductions, 1 find 
that the fame unalterable laws have been obferv-- 
ed ; whence we may eftablifh this general rule,. 
if fome anomalies are excepted, Jn animals, en- 
dowed with a reproductive property, nature reftores 
uo more.than the parts or organs of which they have: 
been deprived. 
ARTICLE V.—FACTS RELATIVE TO THE REPRO 
DUCTION OF THE HEAD OF SNAILS. 
Tats Memoir fhall be terminated with fome 
new experiments, which I hope will not: be difa- 
greeable to the reader, as they. will. elucidate: 
this interefting fubje&t: Hitherto three fpecies. 
of {nails have been mentioned, the pomatia, nemo- 
ralis, and lucorum. But are thefe the only {nails 
enjoying reproductive powers ? "The experiments 
of foreign-naturalifts demonftrate that other fpe- 
cies participate the fame privilege. Yet I mutt ac- 
Knowledge, that my experiments on others have 
glmoft always been void of fuccefs, for they have 
either not repaired the head or horns, or only ex- 
hibited the firft rudiments of reproduction, which 
terminated with the death of the animal. 
But whence does it arife that fome fpecies of 
{nails have the faculty of reproduétion, and. 
others have not? Should fuch a queftion oc-- 
cur, Imuft candidly confefs, that I have had not: 
fufficient: 
iad 
