C 97 ) 
fure you^ that of near 30 Species, I have now by me, found in 
this County alone , not any one can be fampled by any Sea^ 
frejh'VPAter or JL^W-Snai!,thac I havener ever faw.So ihac you 
fee, I have ftill good reafon to doubt of their Original, bcfides 
many other arguments that my Obfervations about Eoffils do 
afford, and which you may poffibly one day fee. A id that 
there are the elegant rcprefentations of even Bivdve-fiells^ 
which never ow'd their original to any Animal , 1 can demon- 
ftrate ; and think none, that hath confidered the thing with me, 
yet hath denyed : Of which hereafter. But whether al befo 
or no, I choofe this method, as the moil: convincing, viz. to 
give a Comparative view. 
Some general ^u^ves concerning Land and Frejh- 
water Snails. 
1. Whether there are other Shell-fnailsatland, than Turbi- 
binate ? 
2. Whether this kind of Infed are truly Androgyna^ and 
equally participate of both Sexes, as Mr. fifft obferv'd ; 
and whether both of them two, which lhall be found in the aft 
of Venery, do accordingly fparvn^ or lay thofe perfectly 
round and clear Eggs, fo frequently to be met with m the fur- 
face of the Earth and in the Water too j and the circumftances 
of thofe Eggs hatching ? 
3. Whether the way of fatting Snails , in ufe amongfl: the 
RomanSythait is,(o make little paved places incirclcd with wa- 
ter, be not alfo very expedient in order to the true noting the 
manner of their Generation ? 
4. What light the Anatomy this Kind of Infed may give 
to the reft ? 
5. Whether the black fpots, obfervable in the horns of 
fome Snails,are Eyes, as fbme Authors affirm 5 and not '-ather 
parts equivalent to the antenn^z of other Infeds;as the flat and 
exceeding thin lhape, alfo the branched horns, in other Species 
of Snails feem to confirm ? 
6. Whether t he r^^faW/i Sanies y which fome of our Water- 
fnails freely and plentifully yield, be not a Saliva than 
O an 
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