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               M I C ROG RAP H1An                                   tfN
about B., which might, perhaps,be their Gills; it feeming always the fame
proportionate diffant from their nofe, from which, to the tip of their
tail, C, their body feem'd to taper.
  Taking feveral ofthefe out of their Pond of Vinegar, by the net of a
finall piece of filtring Paper, and laying them on a black fmooth Glafs
plate, I found that they could wriggle and winde their body, as much
almoft as a Snake, which made me doubt, whether they were a kind of
Eal or Leech.
  I &hall add no other observations made on this minute Animal, being
prevented herein by many excellent ones already publif-i'd by the inge-
nious, Do&or Power, among his Afierorfopical Obfervations, I-ve onely
that a quantity of Vinegar repleat with them being included in a Imall
Viol, and ftop'd very clofe from the ambient air, all the included Worms
in a very fhort time died, as if they had been ftifled.
  And that their motion feems (contrary to what we may obferve in the
motion of all other Infefts) exceeding flow. But the reafon of it feems
plain, for being to move to awd fro after that manner which they do, by
waving onely, or wrigling their body 5 the tenacity, or glutinoufnefs,
and the denfity or refiftance of the fluid medium becomes fo exceeding
fenfible to their extremely minute bodiesthat it is to me indeed a greater
wonder that they move them fo faft as they do,then that they move them
no fafter. For what a vaftly greater proportion have they of their fuper-
ficies to their bulk, then Eels or other larger Fifhes, and next, the tena-
city and denfity of the liquor beifig much the fame to be movedboth by
the one and the other, the reliance or impediment thence arifing to
the motions made through it, muff be almoft infinitely greater to the
finall one then to the great. This we find experimentally verify'd in the
Air, which though a medicik a thoufand times more rarify'd then the wa-
ter,the refiftance of it to motions made through itbis yetio'fenfible to
ve-
ry minute bodies,that a Down feather(the leaft of whofe parts feem yet
bigger then thefe Eels, and many of them almoft incomparably bigger,
fuch as the quill and ftalk) is fufpended by it, and carried to and fro as
if
it had no weight.
Obferv. L V I I I. Of a new Property in the Air, andfeveralother
    tranfparent Mediums nam'd Infledion, whereby very many con-
    fidterable Phxnomena are attemptedto bejolv'd, and divers other
    ufes are hinted.
 S Ince the Invention (and perfeding in fome meafure) of Telefcoper, it has
 L been obferv'd by feveral, that the Sun and Moon neer the Horizon,
 are disfigur'd C lofing that exa&lly-fmooth terminating circular limb,
 which they are obferv'd to have when fituated neerer the Zenith) and
 are bounded with an edge every way (efpecially upon the right and left
                                    G g                      iides)