This historic book may have numerous typos and missing text.
Purchasers can download a free scanned copy of the original book
(without typos) from the publisher. Not indexed. Not illustrated.
1917 Excerpt: ...to a parchmentpaper sea-water dialysate of the
juice, so that light-production is undoubtedly connected with the
visible globules and granules of the juice. That it is connected
with the solution of the granules is indicated by the fact that
fresh-water but not salt-water or isotonic canesugar is able to
call forth the production of light. The process appears to be
similar to the cytolysis of cells, as can be observed by an
inspection of table 8, which shows the effect of adding various
substances to the dark juice of Cavernularia. The light-giving
granules of Cavernularia will pass through an alundum filter
crucible (R A 84) of the finest pores, but not through a
Pasteur-Chamberland filter-tube. The liquid passing through the
latter is perfectly clear and non-luminous and gives no fight when
water is added. There is no adsorption of the light-producing
substance by boneblack or Fe(OH)8. ELECTRICAL STIMULATION. The
juice of Cavernularia filtered through filter paper does not
respond to the strongest interrupted induced shocks. The living
colony, however, responds readily. When a galvanic current is
passed through one of the excised polyps mounted between
non-polarizable electrodes, a flash of light occurs on the make and
a series of flashes while the current is passing, which cease on
the break. There is no flash of light on the break. A similar
response can be observed with Noctiluca (2). It will be remembered
that Romanes (25) observed a series of contractions in the bell of
a medusa during the passage of a galvanic current, and the
sartorius muscle of the frog often contracts on the make of a
galvanic current, remains contracted during the passage of the
current, and relaxes on the break. If the whole colony be
stimulated by weak induced shocks, there is...
|Country of origin:
Carnegie Institution of Washington
||246 x 189 x 8mm (L x W x T)
||Paperback - Trade
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