A brass cone, g, fitting the under side of the stage, N I S, to exclude superfluous light. The illuminator, or convex lens, _d_, Fig. 1, fitted to T of the stage. The jointed nippers, _b_, fitted to the stage, and either on the point or nippers to hold any small insect, or other opake object. An ivory black and white piece, _h_, is also fitted to the point to contrast the colour of any object laid thereon; the light upon this is reflected from the silver concaves placed above, which reflect the light downwards received from the mirrors at O. Six ivory sliders as shewn at _i_, containing a selection of objects, placed between Muscovy talc, and fastened by spring wires; and a brass frame slider, _k_: all for the stage, K, when in use. A set of glass tubes for fish or liquids, _l_, to be filled with water and stopped with cork, for the slider-holder K. A pan, _c_, for fish or frogs, fitted to the stage at S. A small ivory box, _m_, with spare talcs and wires. The explorator, _n_, a lens set in a brass cell, for viewing the larger sort of objects either by the hand, or from the arm C D, Fig. 2. A plane glass, _o_, and a concave ditto, _s_, both fitted to the hole of the stage, N I S, for viewing fluids, and confining the animalcula, &c. between them, and so forming what is called the AQUATIC MICROSCOPE. A brass box, _p_, with a concave and plane glass, for insects and other objects, fitted to the stage N I S, when they are to be examined by the instrument. A pair of brass forceps, _q_, to take or hold any object by. A camel hair brush, _t_. ADDITIONAL APPARATUS TO THIS BEST MICROSCOPE. Three large wood sliders, as shewn at X, with talcs and wires, for the larger sort of wings of flies, and other objects which are too large for the small ivory sliders, _i_; they are to be placed in the slider-holder K, when on the stage N I S, and the objects to be magnified either by the magnifiers in the wheel P, or the lens shewn at _n_, screwed on the arm C D. A brass cell, _y_, with a very small globule or lens, or an extraordinary great magnifier, usually about the 30th or 40th of an inch focus; it is to be screwed into the arm C D, when the wheel, P, is first unscrewed away. It is for the purpose of viewing extreme minute objects, which may be so small as to elude the power of the magnifiers in the wheel, P.