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I. Microfco^ical Ohfer'Vations on. the palates of Oxen., 
■ Sec. By Mr. Anthony van Leeuwenhoek, 
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'Delft vci HoUcind,^ O^ober 
I Took a Cow’s or Oxe’s H^ad, and cut out of the 
Mouth of it the Roof or Palate, clofe to the Throat, 
while it was yet warm ; and having prejfi: it gently, I 
cou’d perceive that there iffued out of fevcral Parts of it, 
fmall, round, protuberant, and tranfparent Drops ; and 
having preft it a little harder, there followed a yellow 
Moifture. ' 
I took the uppermofl: Skin of thefaid Part, and view- 
ed it thro’ aMicrofeope, andobferved, That upon mod: 
of the Places from which the aforefaid Moiftnefs or Li- 
quor proceeded, there was a round Ring or Circle, that 
was of fomething a darker Colour than the Skin or 
Membrane that was next it ; I cou’d like wife perceive 
in fome of the faid Places, out of which, the Liquor 
came, that there were fmall Holes or Orifices. 
Thefe moift places were not all of equal diftance from 
each other. 
'From thefe Difeoveries I began toconfider, whether 
the clofed Parts (which I had obferved in the Mem- 
brane after it was flipp’d offj out of which the Moi- 
fture proceeded, were not Valves,* fhro’ which the Moi- 
ftiire was brought into the Mouth, but none of -it ad- 
mitted to return the fame way. 
Moreover 
