Lighting and Ventilating by Gas.--Advantages of gas over
electricity, etc.--By WM. SUGG. 2 figures.

Ander's Telephone. 1 figure.

Brown's Electric Speed Regulator. 1 figure.

Magneto-electric Crossing Signal. 2 figures.

The Chromatoscope.--An aid to microscopy.

V. ART AND ARCHITECTURE.--The Barbara Uttmann Statue at
Annaberg, Saxony.

Improvements in Concrete Construction.--Use of Portland
cement.--System of building in concrete invented by Messrs. F. &
J.P. West, London.

Albany Buildings. Southport.--An engraving.

VI. PHYSIOLOGY, HYGIENE, ETC.--The Sizes of Blood Corpuscles
in Mammals and Birds.--A table.

The Absorption of Petroleum Ointment and Lard by the Skin.

VII. MISCELLANEOUS.--The Missing German Corvette Augusta.--With
engraving.

The Tails of Comets.--The effect by a disturbance of solar
waves, and not by special matter.

* * * * *

ROMAN REMAINS AT LEICESTER, ENGLAND.

The Roman tessellated pavement in Jewry Wall Street, Leicester,
discovered in the year 1832, is well known to archaeologists; it has
also been known as difficult of access, and hardly to be seen in a dark
cellar, and, in fact, it has not been seen or visited, except by very
few persons. Some time ago the Town Council resolved to purchase the
house and premises, with the object of preserving the pavement _in
situ_, and of giving additional light and better access to it, and, this
purchase having been completed in the beginning of the present year, the
work of improvement began. It was now seen that the pavement was
continuous under the premises of the adjoining house, and under the
public street, and arrangements were at once made to uncover and annex
these adjoining parts, so as to permit the whole to be seen at one view.
The pavement thus uncovered forms a floor which, if complete, would
measure 23 feet square; it lacks a part on the west side, and also the
entire south border is missing. It is a marvel of constructive skill, of
variety and beauty in form and color, and not the least part of the
marvel arises from the almost beggarly elements out of which the
designer has produced his truly harmonious effects. No squared,
artificially colored, or glazed tesserae, such as we see in a modern
floor, are used, but little pieces, irregularly but purposely formed of
brick and stone. There are three shades of