as E, IG, B, &c., and below as †Ab, †Fo, &c., and then the fifths above and below these tones. The names of the tones thus tuned are apparent from Table V. This tuning is much simpler than any system of temperament, and can be successfully conducted by ear only, taking care to avoid all beats in the middle octave c to c2.

SCHEME FOR FOUR CONCERTINAS.

1. Ab Concertina.

Manuals.. C, D dɔ, E †e, F †ƒ, G ∞, A tab, B tử,
Scales....D, tab, †Eb, (†Bb), [F], C; [b], ƒ, c.

2. †B Concertina.

Manuals.. C †c, Dc, †E teb, †F ƒ‡, G †g, †A †æ, B †bb,
Scales....+E, †Bb, †F, (†C), [G], D; [c], g, d.

3. C Concertina.

Manuals..Cc Dd, E ‡d, F f➡ G ‡9#, A †a, Bb,
Scales....F, C, G, (D), [4], E; [‡d], a, e,

4. D Concertina.

Manuals.. Cc, D‡d, E te, E‡ƒ‡, G g‡, †A a‡, B †b,
Scales....G, D, †A, [†E], [B], F#; [e], b, ƒ‡.

In Table III. the first column shows the number of degrees of any tone, two tones whose degrees differ by one-sixteenth being schismatic equivalents. The second column contains the notes of the tones. The third column contains the logarithm of the ratio of their pitch to that of c, whence the ratio itself, the absolute pitch, and the length of the monochord are readily found. In the fourth column E marks Euler's primary, and E his secondary tones; H, H2 the tones on Helmholtz's lower and upper board; T, the 40 tones of General T. Perronet Thompson's Enharmonic Organ; P, the 50 tones of Mr. Poole's Euharmonic Organ; t, the 72 tones of Table V., cols. III. to VIII.; 8, the 24 tones out of these 72 which may be played as their adjoining schismatic substitutes without injuring the harmony; se, the 3 tones which, if played as their schismatic equivalents, would produce a slight but sensible error; t, not followed by either s or se, the 45 tones which form the minimum number of a justly intoned or teleon scale; et, the 12 tones of the equally tempered scale. The seven tones of the major scale of C are printed in capitals in the second column.

§ Hence the symbol ¶ for Pythagoras, with the † (comma) prefixed.

* Approximately.

Major-General SABINE, President, in the Chair.

The following communications were read :

I. "On the Osteology of the genus Glyptodon." By THOMAS HENRY HUXLEY, F.R.S. Received December 30, 1863.

In 1862 the author communicated to the Royal Society an account of the more remarkable features of the skeleton of a specimen of the extinct genus Glyptodon which had been recently added to the Museum of the Royal College of Surgeons; and he then promised to give a full description of the skeleton, illustrated by appropriate figures, in a memoir to be presented in due time to the Royal Society. The present communication consists of Part I., and Sections 1 and 2 of Part II., of the promised memoir. Part I. contains the history of the discovery and determination of the remains of the Hoplophoride, or animals allied to, or identical with Glyptodon clavipes. Part II. is destined to comprehend the description of the skeleton of Glyptodon clavipes (Owen)-Hyplophorus Selloi? (Lund); and the Sections 1 and 2 now given contain descriptions of the skull and the vertebral column.

The preliminary notice already published in the Proceedings (Dec. 18, 1862, vol. xii. p. 316) will serve as an abstract.