arising therefrom. 10277

VI. ENGINEERING.--Estrade's High Speed Locomotive.--A comparative
review of the engineering features of M. Estrade's new
engine, designed for speeds of 77 to 80 miles an hour.--1
illustration. 10266

Machine Designing.--By JOHN B. SWEET.--First portion of a
Franklin Institute lecture on this eminently practical
subject.--2 illustrations. 10267

VII. METEOROLOGY.--The Peak of Teneriffe.--Electrical and
meteorological observations on the summit of Teneriffe. 10265

VIII. MISCELLANEOUS.--Analysis of a Hand Fire Grenade.--By
CHAS. CATLETT and R.C. PRICE.--The contents of a fire
grenade and its origin. 10271

How to Catch and Preserve Moths and Butterflies.--Practical
directions for collectors. 10275

The Clavi Harp.--A new instrument, a harp played by means of
keys arranged on a keyboard--1 illustration. 10275

Inquiries Regarding the Incubator.--By P.H. JACOBS.--Notes
concerning the incubator described in a previous issue
(SUPPLEMENT, No. 630).--Practical points. 10265

IX. PHYSICS.--The Direct Optical Projection of Electro-dynamic
Lines of Force, and other Electro-dynamic Phenomena.--By Prof.