described and illustrated.--4 illustrations.

The Electrical Manufacture of Phosphorus.--Note upon a new
English works for this industry.

V. GEOGRAPHY.--The Mississippi River.--By JACQUES W. REDWAY.
--An interesting paper on the great river and its work and
history.

VI. MECHANICAL ENGINEERING.--How to Find the Crack.--
Note on a point in foundry work.

Riveted Joints in Boiler Shells.--By WILLIAM BARNET LE
VAN.--Continuation of this practical and important paper.
--10 illustrations.

VII. MEDICINE AND HYGIENE.--Influence of Repose on the Retina.
--Important researches on the physiology of the eye.

The Relation of Bacteria to Practical Surgery.--By JOHN B.
ROBERTS, A.M., M.D.--A full review from the surgeon's standpoint
of this subject, with valuable directions for practitioners.

VIII. MINERALOGY.--Precious and Ornamental Stones and Diamond
Cutting.--By GEORGE FREDERICK KUNZ.--An abstract
from a recent census bulletin, giving interesting data.

IX. MINING ENGINEERING.--Mine Timbering.--The square system
of mine timbering as used in this country in the Pacific coast
mines and now introduced into Australia.--1 illustration.