VI. METEOROLOGY.--The "Meteorologiske Institut" at Upsala,
and Cloud Measurements.--The methods used and results
attained in the famous Upsala observatory under Profs. Ekholm
and Hagström; the measurement of clouds.--1 illustration. 9764

VII. MISCELLANEOUS.--Drawing Instrument for Accurate Work.--By
J. LEHRKE.--A magnifying instrument for fine work and
measurements.--2 illustrations. 9754

Liquid and Gaseous Rings.--Notes on the production of vortex
rings.--The different aspects and breaking up of smoke
rings.--6 illustrations. 9760

Scenes among the Extinct Volcanoes of Rhineland.--The
picturesque features of the geological formations of this
region described.--10 illustrations. 9762

Shall We Have a National Horse?--An eloquent plea by RANDOLPH
HUNTINGTON for the production of a good type of animal.--Use
of the Arabian horse as an improver of the breed. 9760

VIII. NAVAL ENGINEERING.--Trial Trip of the Ohio.--The remarkable
results attained by the introduction of new boilers and
machinery in an American steamship. 9751

IX. PHYSIOLOGY.--Apparatus for Determining Mechanically the
Reaction Period of Hearing.--An interesting study of the time
of transmission of an impulse through the sensor and motor
nerves.--1 illustration. 9753