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Amongst many unsolicited Testimonials the following has been received by the maker:

EDINBURGH, May 31, 1889. DEAR SIR.-I have just returned from a six weeks' stay at the Ben Nevis Observatory, and while there had an opportunity of testing the admirable qualities of your new "Watkin' Aneroid. The result has been most satisfactory, the extreme error noted being only about 8 of an inch. During my stay at the Ob. servatory the Aneroid was Frequently tested by taking tdown 2000 feet and then omparing it with the stanlard on my return. The results obtained speak volumes for the high-class workmanship and great accuracy you have attained in the manufacture of this instrument.

To be obtained of all Opticians and Wholesale Houses.
J. J. HICKS, 8, 9, & 10 HATTON GARDEN, LONDON.

[All Rights are Reserved.

BROWNING'S

MICROSCOPE.

The body is made entirely of brass and gun-metal, with rack-motion and fine screw adjustment. Three achromatic powers (separable) of excellent defining power, 1-inch, -inch, and 4-inch; adjusting slide-holder to stage, revolving The whole packed diaphragm, hand-forceps, stage-forceps, live-cage, &c.

in upright Mahogany Cabinet, with drawer for slides, dissecting-knives, &c.
PRICE £3 15s. Od.

New Illustrated Catalogue of Microscopes free.
JOHN BROWNING, 63 Strand, London, W C.

The 'STAR MICROSCOPE is a modern marvel at its low price. THE SEA-LEVEL ANEROID

The lenses alone are worth the money."-British Medical Journai.

BECK'S

£2 2s. to £5 5s.

NEW

MODEL

"STAR" MICROSCOP

made

through

out in brass, neatly japanned, and is

not only first-rate in optical qualities,

but is now a handsome, well-finished Instrument.

& J. BECK, 68 Cornhill, London, E.C.

(WHITESIDE-COOK'S PATENT).

With this Aneroid no calculation or technical knowledge is required. It
Every one is aware that the altitude
meets a long-recognized want.
affects the readings of the Barometer, but many people do not know exactly
what correction to make.
ILLUSTRATED DESCRIPTION POST FREE.