of the more expensive ones, and have been in use for four
years. To use a lamp attachment, all that is necessary is to have a
No. 2 burner lamp with a riveted sheet-iron chimney, the chimney
fitting over the flame, like an ordinary globe, and extending the
chimney (using an elbow) through the tank from the rear, ending in
front. It should be soldered at the tank. The heat from the lamp will
then pass through the chimney and consequently warm the surrounding
water.--_Rural New-Yorker._

[For description and illustrations of this incubator see SUPPLEMENT,
No. 630.]

* * * * *

THE PEAK OF TENERIFFE.

The Hon. Ralph Abercromby made a trip to the island of Teneriffe in
October, 1887, for the purpose of making some electrical and
meteorological observations, and now gives some of the results which
he obtained, which may be summarized as follows: The electrical
condition of the peak of Teneriffe was found to be the same as in
every other part of the world. The potential was moderately positive,
from 100 to 150 volts, at 5 ft. 5 in. from the ground, even at
considerable altitudes; but the tension rose to 549 volts on the
summit of the peak, 12,200 ft., and to 247 volts on the top of the
rock of Gayga, 7,100 feet. A large number of halos were seen
associated with local showers and cloud masses. The necessary ice dust
appeared to be formed by rising currents. The shadow of the peak was
seen projected against the sky at sunset. The idea of a southwest
current flowing directly over the northeast trade was found to be
erroneous. There was always a regular vertical succession of air
currents in intermediate directions at different levels from the
surface upward, so that the air was always circulating on a
complicated screw system.

* * * * *

ESTRADE'S HIGH SPEED LOCOMOTIVE.

We illustrate a very remarkable locomotive, which has been constructed
from the designs of M. Estrade, a French engineer. This engine was
exhibited last year in Paris. Although the engine was built, M.
Estrade could not persuade any railway company to try it for him, and
finally he applied to the French government, who have at last
sanctioned the carrying out of experiments with it on one of the state
railway lines. The engine is in all respects so opposed to English
ideas that we have hitherto said nothing about it. As, however, it is
going to be tried, an importance is gi