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like manner of growing I have formerly faid to have place in 
Plmts ; only with this difference, that, when the fuperfice of 
anioift Globul, which is driven out of the Plant, is become 
fomewhat ftiff, the moifture is then propelled out of the upper 
end of the plant, and that by a continual fucceflion. Which 
kind of progrefs of growing I apprehend may in feme manner 
be feen in the Pith of Wood^ in Cork^mtht Pith of Membranes^ 
as alfo in the White of a ^uill ; of which three laft I have fent 
you and your curious Friends fome fmall particles,cutofF with 
a fliarp Pen-knife, thinking it well worth their obfervation. 
Only I would here advertife, that whenany of thefe particles 
is appl led to the pin of fuch a kind of Microfcope as mine is, 
the inftrument may be held withindoors and in thelhade, yet 
held to the free Air, as if with a Telefcope you would 
look upon the Stars in the Firmament. 
Other Ohfervations made by Mr. Leeuwenhoeck, about Sweat, 
Fatt,Teares; imparted to the Fublijher in a Letter of ]u\y 
the 6^^ 1674. 
!♦ T Have often viewed the Srveat of my face, which confifted 
of a Cryftallin moifture, in which I faw fome, but very 
few, tranfparent Globuls, as alfo a very few, but bigger and 
odd particles of different forms, which latter I eftecm to be 
particles fcaled off from the Cuticulaor uppermoft skin. " 
2, I bavealfoobferv'd the Sweat of feveral Horfes ; firft 
in fuch, as f\^^et but a little, yet fo that I could wipe off fome 
drops of Sweat from their heads: In which I faw likewife 
fomeGlobuls fwimming in the Cryftallin humidity, as alfo 
fome odd bigger parts : But then in Horfes that had iabour'd 
harder, or run more violently,and fwet fo as that white fweat- 
drops run from their body, I faw in them a great abundance 
of Globuls moving in the Cryftallin moifture, together with 
fome of thofe odd bigger parts, which I likewife judged to 
befcalings off from the Cuticula. 
3. Heretofore I acquainted you, that I imagined to have 
feen Hair as made up of united Globuls , and to have alfo 
obferv'd Elephants hair to confift of the like. I cannot omic 
now 
