By S. Piet. Sa’l-vetti. n. 87.i'-

' Uy M. Lceu-,v.’cnhocc!c.n. A4. p. SoZ 7 -

By Mr. Butterfrcid. n. 141.$ 102 6 .

'S-, \fr. Steph.fOiray. n. 221p. 280.

{ 228 )

It is almöst I (\\ Inclies liigli, and adjusted at four different Lengths. In•the iuli, which is the lealt, it shews Lines 41 times bigger rhan they appeti.to the Nakcd Eye ; In the iecond, 90 times; In the third, m times; Andin the fourth, 14z times: Whcncc one may casily Calculate, how much i raugments Surfaces and Solidities.

z. S. Sahctti lately shew’d one os his Microfcopes, made in Imitation östhole of Divini and Cmipmii, to the Creat Duke of Tuscany, which vas judgedby all much bettet that» any of the best: his Highnels hath. It was found,for Magnifying, Dehning, and Clcarnels, to be very Excellent.

5. M. I.ccuxvcnhocck^ hath lately contrivcd Microfcopes, excelling thole thatlinve been hitherto made by Kuflr.cbio Divini, and others.

4. I luve Microfcopes of the mannet lately brought out öf Holland by■ Mr. Huygcns, of levcral Falhions rcady made. I have tried leveral ways for

the making of Glasscs of the bigncls of a great Pin’s Head and leis ; as in>the Flame of a Tallow Candlc, andof one of VVax. But the bell way of.all I have yet found, to make them Cieat and without Specks, is with the-Flame of Spirit of Wine well Rcctilied, and burned in a Lamp. In-•Jfead of Cotton 1 make use of very ffnall Silver Wire, doublcd up and down•like a Skcin of Thread; which being <Wet with the Spirit of Wine, andmade to burn in the Lamp, giveth > through the Veril of the Lamp, a veryArdent Flame. Then take your beaten Glals, being siris walhed very■clean, upon the point of a Silver Ncedle filed very Imall, and wet with Spit-tle. Hold it thus in the Flame till it be quite round, and no longer for fear■cf Burning it ; and if the fide of the Glals next the Necdlc be not melted,you may put it ofl and take it up with the Necdlc on the Round fide, pre-lenting the Rough fide to the Flame, till it be evety where Round and Smooth,then wipe and rub one or leveral of them together with löst Leather, whichmakes them much the bettet. Then put them bctween two pieces of thinBrals, the Apcrtures very round and without Bur, and that towards the EyeIb big almoit as the Diameter of the Glals ; aud Ib placed in a Frame withthe Object convcniently for Oblervation.

5. I took a Imall Particle of Glals, about the bignefs I defigned my Glo-' bule, and laying it on the end of a Charcoal, I could by the help of a Blait-

Pipe with the Flame of a Candlc, Ibon melt it into a Spherule: and by thismeans I could make them indifferently Ciear, and the Imallelt very Round,and I could make them much larger, than by the unallilted Heat of the Can-dlc.; but thele lauer wcre attended with an Inconvenicnce, they wer e, onthat side that relted on the Coal, Hatted, and receivcd a rough Impressiontrom ir. To Remedy this Inconvenicnce, I was wont ro Grind them andPulilh them on a Brals Plane, and Ib reduce them to Hemilphxrules; but I. found the ciear Imall Globules, not to mention that they Magnitie more,fhew Objects more Distinctly.

XXIV. 1. AB/