ON THE ORIGIN OF SPECIES BY MEANS OF NATURAL SELECTION; or, THE
PRESERVATION OF FAVORED RACES IN THE STRUGGLE FOR LIFE. New and revised
edition. 12mo. Cloth. 480 pages. Price, $2.00.
THE DESCENT OF MAN, AND SELECTION IN RELATION TO SEX. With
Illustrations. New edition, revised and augmented. 12mo. Cloth. 704
pages. Price, $3.00.
A NATURALIST'S VOYAGE ROUND THE WORLD; or, A JOURNAL OF RESEARCHES INTO
THE NATURAL HISTORY AND GEOLOGY OF THE COUNTRIES visited during the
voyage of H.M.S. Beagle, under the command of Captain Fitz-Roy, R.N.
12mo. Cloth. 530 pages. Price, $2.00.
THE EXPRESSION OF THE EMOTIONS IN MAN AND ANIMALS. With Photographic
and other Illustrations. 12mo. Cloth. Price, $3.00.
THE THEORY OF DESCENT, AND DARWINISM. By Prof. OSCAR SCHMIDT,
University of Strasburg. 12mo. Cloth. Price, $1.50.
BY CHARLES DARWIN, M.A., F.R.S.
DROSERA ROTUNDIFOLIA, OR THE COMMON SUN-DEW.
Number of insects captured--Description of the leaves and their
appendages or tentacles-- Preliminary sketch of the action of the
various parts, and of the manner in which insects are
captured--Duration of the inflection of the tentacles--Nature of the
secretion--Manner in which insects are carried to the centre of the
leaf--Evidence that the glands have the power of absorption--Small size
of the roots...Pages 1-18
THE MOVEMENTS OF THE TENTACLES FROM THE CONTACT OF SOLID BODIES.
Inflection of the exterior tentacles owing to the glands of the disc
being excited by repeated touches, or by objects left in contact with
them--Difference in the action of bodies yielding and not yielding
soluble nitrogenous matter--Inflection of the exterior tentacles
directly caused by objects left in contact with their glands--Periods
of commencing inflection and of subsequent re-expansion--Extreme
minuteness of the particles causing inflection--Action under
water--Inflection of the exterior tentacles when their glands are
excited by repeated touches--Falling drops of water do not cause
inflection...19-37 [page vi.]
AGGREGATION OF THE PROTOPLASM WITHIN THE CELLS OF THE TENTACLES.
Nature of the contents of the cells before aggregation--Various causes
which excite aggregation--The process commences within the glands and
travels down the tentacles-- Description of the aggregated masses and
of their spontaneous movements--Currents of protoplasm along the walls
of the cells--Action of carbonate of ammonia--The granules in the
protoplasm which flows along the walls coalesce with the central
masses--Minuteness of the quantity of carbonate of ammonia causing
aggregation--Action of other salts of ammonia--Of other substances,
organic fluids, &c.--Of water--Of heat--Redissolution of the aggregated
masses--Proximate causes of the aggregation of the protoplasm--Summary
and concluding remarks--Supplementary observations on aggregation in
the roots of plants...Pages 38-65
THE EFFECTS OF HEAT ON THE LEAVES.
Nature of the experiments--Effects of boiling water--Warm water causes
rapid inflection-- Water at a higher temperature does not cause
immediate inflection, but does not kill the leaves, as shown by their
subsequent re-expansion and by the aggregation of the protoplasm-- A
still higher temperature kills the leaves and coagulates the albuminous
contents of the glands...66-75
THE EFFECTS OF NON-NITROGENOUS AND NITROGENOUS ORGANIC FLUIDS ON
Non-nitrogenous fluids--Solutions of gum arabic--Sugar--Starch--Diluted
alcohol--Olive oil-- Infusion and decoction of tea--Nitrogenous
fluids--Milk--Urine--Liquid albumen--Infusion of raw meat--Impure
mucus--Saliva--Solution of isinglass--Difference in the action of these
two sets of fluids--Decoction of green peas--Decoction and infusion of
cabbage--Decoction of grass leaves...76-84 [page vii.]
THE DIGESTIVE POWER OF THE SECRETION OF DROSERA.
The secretion rendered acid by the direct and indirect excitement of
the glands--Nature of the acid--Digestible substances--Albumen, its
digestion arrested by alkalies, recommences by the addition of an
tissue--Cartilage--Fibro-cartilage-- Bone--Enamel and
dentine--Phosphate of lime--Fibrous basis of bone--Gelatine--Chondrin--
Milk, casein and
Cellulose--Gun-cotton--Chlorophyll--Fat and oil--Starch--Action of the
secretion on living seeds--Summary and concluding remarks...Pages
THE EFFECTS OF SALTS OF AMMONIA.
Manner of performing the experiments--Action of distilled water in
comparison with the solutions--Carbonate of ammonia, absorbed by the
roots--The vapour absorbed by the glands- -Drops on the disc--Minute
drops applied to separate glands--Leaves immersed in weak
solutions--Minuteness of the doses which induce aggregation of the
protoplasm--Nitrate of ammonia, analogous experiments with--Phosphate
of ammonia, analogous experiments with- -Other salts of
ammonia--Summary and concluding remarks on the action of salts of
THE EFFECTS OF VARIOUS OTHER SALTS, AND ACIDS, ON THE LEAVES.
Salts of sodium, potassium, and other alkaline, earthy, and metallic
salts--Summary on the action of these salts--Various acids--Summary on
their action...174-198 [page viii.]
THE EFFECTS OF CERTAIN ALKALOID POISONS, OTHER SUBSTANCES AND
Strychnine, salts of--Quinine, sulphate of, does not soon arrest the
movement of the protoplasm--Other salts of