L A Letter from Mr, Anthony van Leeuwen- 
hoek, P, 5. containing his OhferVatwns upon 
the White Matter on the Tongues of FeVeriJh <?er- 
fonsj 8cc, 
Delfiy fune 1708. N. S.. 
Honourable Gentlemen^ 
y % 
S INCE my laft Obfervations concerning the Matter 
that was found upon the Tongues of Feverili Per- 
Ibns r as alfo on the protuberant Parts on the Tongues, 
of Oxen, Cows and Hogs, which I have communicated 
fome time fince to your Honours ; I take the liberty to 
lay before you the following Remarks. In the latter 
end of the Month, of April lalf,. I was again attack’d 
by^ a violent Feverj which lafted with me four Days, 
and was every Night accompany’d with an encreafing : 
And forafmuch as my Tongue was again cover’d with 
a thick whitifh' Matter, I took a Penknife, and fome- 
times a Silver^ Tongue Scraper, wherewith I feraped 
off the whitifh Matter, which feem’d to be very ftrong- 
ly united to the Particles of the Tongue, and view’d 
the fame thro’ a Microfeope divers times ; but could dif- 
cover nothing more than I have already mentioned in 
my former Obfervations on that ^ubjcdl ; faving only 
that I cou’d not now perceive fo many of thofe brancht 
Particles, as I did formerly ; which perhaps might pro- 
ceed from my paft Fever’s being more violent than 
ibis. 
r 
I 
