the mine has been but recently opened to its present depth, and the influence of atmospheric temperature will every year become more sensible in the strata below.

The annexed figure represents the protected maximum thermometer, designed by Sir W. Thomson for the purposes of the Committee.

A is the protecting case of glass hermetically sealed,

B the Phillips's thermometer enclosed in it and
supported by three pieces of cork, c, c, c. A small
quantity of spirit, s, occupies the lower part of the
case, the remainder of the space being filled with
air, and d is the air-bubble characteristic of Phil-
lips's thermometer. The detached column of mer-
cury above d remains suspended by adhesion in
spite of moderate shaking. The instrument has
been found to register correctly even under a
pressure of 2 tons to the square inch.

d.

A

B

Section of Strata sunk through (with shaft 16 feet diameter) at Rose-Bridge

Second Report of the Committee appointed to get cut and prepared Sections of Mountain-Limestone Corals for Photographing. The Committee consists of HENRY WOODWARD, F.G.S., Prof. DUNCAN, F.R.S., Prof. HARKNESS, F.R.S., and JAMES THOMSON, F.G.S.

Ix presenting to the Association the second Report on the slicing of corals from the Mountain Limestone, for the purpose of showing their structural characteristics by means of photography, we have to state that considerable progress has been made during the year, but much still remains to be done