C 4^ ) 
Fell.CoU.Vhyf. and R. S. IX An Account ef two Bocks, i Mu- 
feo di Fifica & di Efperienze, &c. by S*gmor Boccone. 
2. ParadifusBatavus, continens plus centum plant.is, Sec, 
with additional Remarks hy Mr* John Ray, ER. S. X. Books 
lately f tinted beyond Sea, 
I. An ExtraEl of a "Letter from Leghorn to Dr. Martin Lifter, 
November 24. 1698. concerning Seignior Kadi's Manufcripts, 
and the Generation of Fleas. 
FO R any thing that Ridi hath left behind him in Manu- 
fcript, although I have enquired of a young Phyfician his 
Domeftick, yet nothing appears : and that fecond part of ^«i- 
mali Dentrogli animali we are like to be without. 
We have an ingenious Naturalift here, whofe Obfervations 
about the Generation of Fleas, I fend you,and are as follows. 
A New Difcovery of, the Original of Fleas , made by the 
Signior D'iacinto Ccftone of Leghorn. 
AT laft is difcovered, by the indefatigable Induftry of 
Signior D'wciwr^? Cefione^ the true way of the Generation 
of Fleas, their Worms, and entire Metamorphofes which have 
been hitherto obfcure, though fought after. The Fleas bring 
forth Eggs (or a fort of JV;>?/) from thefe Eggs are hatched 
Worms ; thefe Worms make to themfelves Bags like Silk- 
Worms, and from out of thefe Bags come Fleas.- 
Fleas therefore depofite their Eggs on Dogs, Cats, Men or 
other Animals infefted with ihero, or in the Places where they 
fleep, which for being round, fmooth,flip ordinarily ftreight 
to the Ground, or fix themfelves in the Plyes or other Ine- 
qualities of the Coverlets and Cloaths. From thefe are brought 
forth white Worms , of a fliining Pearl Colour , which 
feed themfelves on the Brann like Subftance which fticks 
in the Combs when Puppies are combed to take out the Fleas; 
or with certain Downy Subftance that is found in the Plyes 
of Linnot) Drawers;^ or other fuch like Excremenc They 
come 
