( no )

os an Inch Diameter, till thcre was formed fernew liat more than an Hemifepherule of Water ; thcn kceping the Wire Ercct, I applied it to my Eye,and standing ät a proper Distance from the Light, I law them and ferneother irregulär Paiticles, as I had predicted, bat most enormousty rnagnisied ;For whereasthey are Icarcc difeernafc'e by my GlafsMicrofeopes, or first Aque-ous one, within the Globule they appeared not much different both in theirForm, nor lefs in Magnitude than ordinary Peafe. They cannot well be seenby Day-Light, except the Room be darkncd, aster the mariner of the famousDioptrical Experiment, but most distinctly by Candle-Light ; they may bevery well seen by the füll Moon Light. It the Water be conveyed into tlie

r p. 355. Hole B, (which may be about *o of an Inch Diameter) till thcre remain

neue an Hemisphere of Water on each fide c.f the Hole, the Objects aresecn more distinctly ; and the SphericalForm of the Water is this \vay bettcrsectired than on the Point of a Pin Wirc.

-a- p 285 The Reafen of this appearance may be thus Explained. Lct the Circle

D B B D, reprefent a Sphere of Water, A an Object placed in its Focus,

r%. to«. sending forth a Cone of Rays, two of which are AB, AB, which Opticiansknow coming into the Water at B and B, will be Rcfracted from their di-recti Course, and bccome B D, B D ; at D they will, at their palllng intothe Air, be again Rcfracted into D E, D E, and fe run Parallel to onc ano-ther, and to the Axis of the Sphear A F C G. Now ’tis a known and fun-damental Principle in Opticks, that the Angle of Reflexion is equal to theAngle of Incidence ; wherefore let the Rays B D, B D, be imagincd tocomefrom ferne Point of an Object placed within a Sphere of Water, by beingReflected from the Interior Surface of the Sphere at B B, C B D is the Angleof Reflexion, to which making CBF equal, F will be the place where anObject sending forth a Cone of Rays, two of which are F B, F B, whichare Reflected into the Rays BD, BD, and then coming to the other fide theSphere at D and D, they are Rcfracted into D E, D £, as before ; andv.eon-sequently be as fit for Distinct Vision, whether the Object be placed in Fwithin, or in A without the Sphere, if its Interior Surface be considered asa Concave Reflecting Speculum.

Mimsiapes im XXV- From. the Distinction I have elsewhere given between Ccmpounded

j^Newton and Vnccmpoundcd Colours , I take. Occasion to Communicate a way forn, 83 . p. 50K6. the Improvcment of Microfcopes by Refraction ; vi\. By Illuminating theObject in a darkned Room with Light of any convenient Colour not toomuch Compounded .- for by that means the Microseope will with distinctnelsbear a deeper Charge and krger Aperture, espeeially if its Construction befech as I may hereafter deseribe; for the Advantage in ordinary Microfcopeswill. not be so .sensible.

viKefl<ihn$ . XXVI. 1. I have sometimes thöught to make a Microseope, which stiouldLMicroß-ope ■, by j iavG> instead of au Object Glast, a Reflecting piece of Metal. For thefc

1 ‘ ~ ™ 1 p £r i ia p S

as youmay

Instruments seem as capable- of Improvcment as Teleseope.v and ]*’ lo7 ' more; becausc but one Reflcctive piece of Metal is requisite in them,