This is the way, then, that the amplitude is measured. On another hand,
it suffices to keep the apex of the angle of the micrometer immovable,
in order to be sure of the constancy of the tuning fork's amplitude; and
this is done, when necessary, by causing the screw, V, to move slightly.
The instrument represented in Fig. 4 is, moreover, fixed to a support
devised by Mr. A. Duboscq, so as to make it possible to give the tuning
fork every position possible with respect to a vertical plane; to raise
it or lower it, and to move it backward or forward so that it may be
employed for chimography, and in all those experiments in which
electro-tuning folks are used.
E. MERCADIER.
* * * * *
LONGMAN'S MAGAZINE.
OUR ORIGIN AS A SPECIES.
By RICHARD OWEN, C.B., F.R.S.
There seems to be a manifest desire in some quarters to anticipate the
looked for and, by some, hoped-for proofs of our descent, or rather
ascent, from the ape.
In the September issue of the _Fortnightly Review_ a writer cites, in
this relation, the "Neanderthal skull, which possesses large bosses on
the forehead, strikingly suggestive of those which give the gorilla its
peculiarly fierce appearance;" and he proceeds: "No other human skull
presents so utterly bestial a type as the Neanderthal fragment. If one
cuts a female gorilla-skull in the same fashion, the resemblance is
truly astonishing, and we may say that the only human feature in the
skull is its size.
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