Generation of a Child: That isto fay , when within the 
Wcmb J as much as they were here , upon the Ovary. S# 
that it is not , I conceive, reafonably to be doubted , but 
that the Membranes , which we cai! the Secundine or After- 
Birth , are the Individual ougs , which belong to that Vejicle 
or which falls from the Oi/^r; into the Womb : Being 
therein, with their conteined Humor , naturally augment- 
ed and amplified, as here they were preiernaturally, in this 
Hydropical Cafe* 
^Uerofcopicd OhfervAtiom ef the StruHure of Teeth and 
ther Bones : Made and Communicated^ in a Letter by Mr^ 
Anthony Leeuwenhoeck. 
I Have fome time fince applyed a Glafs , (efteemed by 
fever al Gentlemen , who had try'd it, a very good one) 
toobferve theStruflure of the Teeth, and other Bones* 
Which both to them and my felfalfo, then feemed to confift 
Globules. But fince then, having drawn out one of my 
Teeth, and for further Obfervation , applyed better G!af- 
fes than the former ; the fame Gentlemen , with my felf, 
agreed , from what we plainly faw , That the whole Tooth 
was made up of very fmall ftrait and tranfparent Pipes. Six 
or feven hundred of thcfe Pipes put together, I judg exceed 
not the thicknefs of one Hair of a Mans Beard* In the 
Teeth ofa Cow, the fame Pipes appear fomev\hat bigger, 
and in thofe of a Haddock fomewhat lefs. 
Fig, I. Fig, Fig. I. ^ B. Q D. E. is a Square 
piece of a Bone , whereto, al- 
though you apply a good Micro- 
fcope^y^i^t the end ji, B.C. it will 
feem as if compofed of Globules, 
Nor will the Pipes diftinftly ap- 
pear on the fides ^.CD^is.by reafon 
of the thicknefs of the Bone, and 
thereby the trajeflionof lefs light* 
Fig, 2. Is a flat piece of a Bone, in which the aforefaid 
Pipes may be feen^ 
I havealfo obfer.ved part of theShin^Boneofa Calf fix or 
eight weeks old. In which the faid Pipes are kfs ftrait than 
in a Tooth. And fometimes there fevmed to be feveral leflTer 
Pipes 
