stened to an
American who told of having been lost in the depths of the great
forest where for days he lived on monkey meat secured with his rifle
until he found his way to the river. He had no compass and could not
get one. I was sorry I had none to give; I had lost mine in the
rapids.

For the determination of latitude and longitude there is nothing
better than a small four or five inch theodolite not over fifteen
pounds in weight. It should have a good prism eyepiece with an angle
tube attached so it would not be necessary to break one's neck in
reading high altitudes. For days we travelled in the direction the sun
was going, with altitudes varying from 88 deg. to 90 deg.. Because of these
high altitudes of the sun the sextant with artificial horizon could
not be used unless one depended upon star observations altogether, an
uncertain dependence because of the many cloudy nights.

BAROMETERS--The Goldsmith form of direct-reading aneroid is the most
accurate portable instrument and, of course, should be compared with a
standard mercurial at the last weather-bureau station.

THERMOMETERS--A swing thermometer, with wet and dry bulbs for
determination of the amount of moisture in the air, and the maximum
and minimum thermometer of the signal-service or weather-bureau type
should be provided, with a case to protect them from injury.

A tape measure with metric scale of measurements on one side and feet
and inches on the other is most important. Two small, light waterproof
cases could be constructed and packed with scientific instruments,
data, and spare clothing and yet not exceed the weight limit of
flotation. In transit by pack-train these two cases would form but one
mule load.

PHOTOGRAPHIC--From the experience gained in several fields of
exploration it seems to me that the voyager should limit himself to
one small-sized camera, which he can always have with him, and then
carry a duplicate of it, soldered in tin, in the baggage. The
duplicate need not be equipped with as expensive a lens and shutter as
the camera carried for work; 31/4 x 41/4 is a good size. Nothing
larger than 3 1/4 x 5 1/2 is advised. We carried the 3A special Kodak
and found it a light, strong, and effective instrument. It seems to me
that the ideal form of instrument would be one with a front board
large enough to contain an adapter fitted for three lenses. For the
3 1/4 x 4 1/4:

One lens 4 or 4 1/2 focus