Of the CONSTELLATIONS of the SOUTHERN HE-

MISPHERE, with their FABULOUS HISTORY, 32.

DIALOGUE V.

Shewing the Ufe of the CELESTIAL GLOBE in folv-

ing SOLAR PROBLEMS, or fuch as relate to the

SUN,

DIALOGUE VI.

42.

The Ufe of the CELESTIAL GLOBE in a Solution of

LUNAR PROBLEMS, or thofe which relate to the

Motion and Phenomena of the MOON,

51.

The Ufe of the CELESTIAL GLOBE, in the Solution

of PROBLEMS relating to the PLANETS and Co-

METS, exemplified in that which lately appeared, 60.

DIALOGUE VIII.

The USE of the CELESTIAL GLOBE, in the SOLU-

TION of PROBLEMS relative to the STARS,

68.

Of the PRECESSION of the EQUINOX, MUTATIONS of

SEASONS, and the Celestial Phænomena refulting

from the retrograde MOTION of the EARTH'S

Axis about that of the ECLIPTIC, illustrated by

a NEW CONSTRUCTION and Apparatus of the

CELESTIAL GLOBE,

DIALOGUE X.

Of the DESCRIPTION and USE of the

TERRESTRIAL GLOBE,

DIALOGUE XI.

74.

87.

Containing the Solution of the PRINCIPAL PROBLEMS

on the TERRESTRIAL GLOBE,

98.

The DESCRIPTION and USE of a New APPARATUS to the TERRESTRIAL GLOBE, by which the true diurnal MOTION of the EARTH on its Axis, the apparent annual MOTION of the Sun in the Ecliptic, the various Phænomena of DAYS and NIGHTS, the SEASONS of the Year, and of a Solar ECLIPSE, are exhibited by New MACHINERY.

109.

On the Ufe of the New Apparatus to the TERRESTRIAL GLOBE, in explaining the Nature and various Phenomena of SOLAR ECLIPSES, exemplified in that which is to happen in 1764,

120.

DIALOGUE XIV. On the Nature and Ufe of Geographical PROJEC TIONS, ufually called MAPS and CHARTS; with a Specimen of one of a New Construction, comprehending the Western, or Atlantic Ocean, and bis Britannic Majefty's Dominions on the Continents of EUROPE and AMERICA,

127.

The various Phænomena of the TRANSIT OF VENUS over the SUN, June 6, 1761; together with the Ufes thereof, in difcovering the PARALLAX and Distance of the SUN and PLANETS: Exhibited and illuftrated by the TERRESTRIAL GLOBE, and an aftronomical Diagram,

141.

The DESCRIPTION of a new SOLAR APPARATUS, adapted to the reflecting TELESCOPE, for fhewing the TRANSIT OF VENUS Qver the SUN'S DISK, without darkening the Room,

155.

PART V.

CONTAINING

A PRACTICAL TREATISE on the Use of

OPTICAL INSTRUMENTS.

DIALOGUE I.

On the Nature, Conftruction, and Ufe of

MICROSCOPES,

GLE

61.

Of the Nature, Construction, and Use of COM-

POUND MICROSCOPES,

DIALOGUE III.

174.

On the Nature, Conftruction, and Ufe of the SOLAR

MICROSCOPE,

DIALOGUE IV.

182.

The Defcription of a MICROSCOPIC APPARATUS,

confifting of a Single, Compound, and Solar

MICROSCOPE together,

DIALOGUE V.

193.

Of the COLOURS of natural BODIES, and of the

RAIN-Bows, illuftrated by Experiments of the

PRISM, &C.

DIALOGUE VI.

198.

On the Original of TELESCOPES; and their general

NATURE, KINDS, and USES explained, 208.

DIALOGUE VII.

On the various CONSTRUCTIONS of refracting

TELESCOPES,

DIALOGUE VIII.

219.

The NATURE and CONSTRUCTION of refracting

TELESCOPES continued,

229.

DIALOGUE IX.

236.

Of the NATURE, ORIGIN, CONSTRUCTION, and

USE of reflecting TELESCOPES,

DIALOGUE X.

Of the genuine Construction of REFLECTING TELE-

SCOPES, and alfo of a new proportional CAMERA

OBSCURA,

247.

Concerning the TRANSIT of the Planet VENUS, and

its EGRESS from the SOLAR DISK, on June the

6th, 1761, in the Morning; together with fome

CALCULATIONS relative to the ELEMENTS of her

THEORY. Afo of the SATELLITE fuppofed to

attend her,

DIALOGUE XII.

255.

Concerning the NATURE and USE of BINOCULAR

TELESCOPES,

DIALOGUE XHI

270.

The DESCRIPTION and USE of an OPTICAL INSTRU-

MENT for meafuring the ANGLE of VISION, the

apparent MAGNITUDES, and DISTANCES of Ob-

jects; for viewing perspective PRINTS, PICTURES,

Intaglios, &c.

274.

DIALOGUE XIV.

The CONSTRUCTION and USE of the LANTERNA

MAGALOGRAPHICA, vulgarly called, The MACIC

LANTHORN,

DIALOGUE XV.

285

The Defcription and Rationale of the optical Octant,

and Helioftata, or optical CLOCK,

DIALOGUE XVI.

295.

The Defcription and Ufe of the HELIOSTATA, or the

folftitial and planetary CLOCK, on a new Con-

ftruction,

ftruction, for fixing the SUN, MOON, and PLA

NETS in aftronomical OBSERVATIONS,

DIALOGUE XVII.

304.

On the NATURE and USES of SINGLE LENSES, both

Convex and Concave, applied as READING-GLASSES,

VISUAL-GLASSES, and BURNING-GLASSES, 317.

DIALOGUE XVIII.

The NATURE and STRUCTURE of the EYE explained,

with regard to perfect VISION, by an anatomical

DISSECTION thereof,

332.

DIALOGUE XIX.

Of the preternatural CONFORMATION of the EYE;

the DEFECTS of VISION arifing from thence; and

the Means of remedying them by OPTIC GLASSES.

The whole illuftrated by an ARTIFICIAL EYE, 343.

DIALOGUE XX.

On the general NATURE and CAUSE of Sounds, 354.

DIALOGUE XXI.

Of the PROPERTIES of SOUND, with respect to

MUSIC, or HARMONY,

DIALOGUE XXI.

369.

The Rationale of different Kinds of MUSICAL

INSTRUMENTS, confidered,

DIALOGUE XXII.

380.

The Rationale of different Kinds of MUSICAL

INSTRUMENTS, continued,

DIALOGUE XXIII.

393.

On the ORGANS furnished by NATURE, for forming

and variously modifying Animal NOTES, and Voice,

or SPEECH in the human Species,

404.

Of the FACULTY, or SENSATION of HEARING;

with a DESCRIPTION of the particular Parts

concerned in the Organization of the EAR,

411.

THE