ld 
ANIMAL REPRODUCTIONS, 267 
In the Avant Coureur are alfo fome experi. 
ments corroborating mine ; the firft of which is 
this. 
‘H. Roos, a German, now refiding in Paris, 
‘ has undertaken to verify Sig. Spallanzani’s ex- 
‘ periments on decapitated fnails. Some died ; 
* others furvived the operation. One reproduc- 
‘ed the larger horns ; another, which had been 
£ decollated at the root of the horns, acquired a 
“new head and four new horns,’ “ournal, No. 
30> 35> 47> 1768. 
This experiment corréfponds with thofe of M. 
Lavoifier, related in the fame journal, No. 38. 
* We now fpeak of Sig. Spallanzani’s fingular 
‘ difcovery, concerning the reproduction of the 
© head of the fnail, with more confidence, becaufe 
‘M. Lavoifier has fhewn the Royal Academy 
‘ of Sciences a {nail which he decapitated on the 
¢ 12 of laft June, which has reproduced a new 
“head exactly fimilar to the firft. He has feve- 
‘ral more, with the reproduction lefs advanced. 
* The head was cut off a little beyond the large 
‘horns. More than a month elapfed before there 
‘was any fymptom of regeneration, which a 
‘ {mall papilla or tubercle announced. The horns 
* are much thicker than in their natural ftate, 
‘and only a line and a half long. M. Lavoifier 
§ has remarked, thai the part called the tail is alfo 
§ capable of reproduction.’ 
But 
