LXI

— On the cause of the colours in precious Opal. — Edinb. new philos. Journ. 1845. XXXVIII. 385. — L. J.

— On crystals in the cavities of Topaz whicli are dissolved by beat and re-crystallize on cooling. — Edinb.

new philos. Journ. 1855. XXXVIII. 386. — L. J. 1845. 008.

— On the modification of the doubly refracting and physical structure of Topaz by elastic forces, emanating

from minute cavities. — Lond. Edinb. and Dubl. philos. Mag. and Journ. of Science. 1847. XXXI. 101.

— Transact. Roy. Soc. Edinb. XVI. part. 1.7.

— On the existence of crystals with différent primitive forms and physical properties in the cavities of

minerais with additional observations on the new fluids in which they occur. — Lond. Edinb. and Dubi. philos. Magazine and Journ. of Science. 1847. XXXI. 497.

— On the phenomena of luniinous rings in calcareous spar and Béryl as produced by tabular cavities

containing the two new fluids. — Lond. Edinb. and Dublin philos. Mag. and Journ. of Science. 1848. XXXIII. 489.

— On the optical figures produced by the disintegrated surfaces of crystals. Phil. Mag. 1853. V. 16.

— Ueber Hôhlungen in Bernstein mit Gasen. — Philos. Mag. (4). V. 233. — P. A. 1854. XCI. 005. — L. J.

— Ueber eine merkwûrdige mit Flûssigkeit gefûllte Hohlung in Topas. — Philos. Mag. (4). V. 235. — P. A.