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CHARLES DARWIN'S WORKS.

ORIGIN OF SPECIES BY MEANS OF NATURAL SELECTION, OR THE PRESERVATION OF FAVORED RACES IN THE STRUGGLE FOR LIFE.

Revised edition, with Additions. 12mo. Cloth, $2.00.

DESCENT OF MAN, AND SELECTION IN RELATION

TO SEX. With many Illustrations. A new edition. 12mo.
Cloth, |3.00.

JOURNAL OF RESEARCHES INTO THE NATURAL
HISTORY AND GEOLOGY OF COUNTRIES VIS-
ITED DURING THE VOYAGE OF H. M. 8. BEAGLE
ROUND THE WORLD. New edition. 12mo. Cloth, $2.00.

EMOTIONAL EXPRESSIONS OF MAN AND THE LOWER ANIMALS. 12mo. Cloth, $3.50.

THE VARIATION OF ANIMALS AND PLANTS UNDER DOMESTICATION. With a Preface, by Professor Asa Gray, 2 vols. Illustrated. Cloth, $5.00.

INSECTIVOROUS PLANTS. 12mo. Cloth, $2.00.

MOVEMENTS AND HABITS OF CLIMBING PLANTS.

With Illustrations. 12mo. Cloth, $1.25.

THE VARIOUS CONTRIVANCES BY WHICH ORCHIDS ARE FERTILIZED BY INSECTS. Revised edition, with Illustrations. 12mo. Cloth, $1.75.

THE EFFECTS OF CROSS AND SELF FERTILIZATION IN THE VEGETABLE KINGDOM. 12mo. Cloth, $2.00.

DIFFERENT FORMS OF FLOWERS ON PLANTS OF THE SAME SPECIES. With Illustrations. 12mo. Cloth, $1.50.

THE POWER OF MOVEMENT IN PLANTS. By Charles Darwin, LL. D., F. R. S., assisted by Francis Darwin. With Illustrations. 12ino. Cloth, $2.00.

THE FORMATION OF VEGETABLE MOULD THROUGH THE ACTION OF WORMS. With Observations on their Habits. With Illustrations. 12mo. Cloth, $1.50.

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D. APPLETON & CO.'S PUBLICATIONS,

THOMAS H. HUXLEY'S WORKS.

SCIENCE AND CULTURE, AND OTHER ESSAYS. 12rao. Cloth, $1.60.

THE CRAYFISH: AN INTRODUCTION TO THE STUDY

OF ZOOLOGY. With 82 Dlustrations. 12mo. Cloth, $1.75.

SCIENCE PRIMERS: INTRODUCTORY. ISmo. Flexible cloth, 45 cents. 't

HAN'S PLACE IN NATURE. 12mo. Cloth, $1.25.

ON THE ORIGIN OF SPECIES. 12mo. Cloth, $1.00.

MORE CRITICISMS ON DARWIN, AND ADMINISTRATIVE NIHILISM. 12mo. Limp cloth, 50 cents.

MANUAL OF THE ANATOMY OF VERTEBRATE ANIMALS. Illustrated. 12mo. Cloth, $2.50.

MANUAL OF THE ANATOMY OF INYERTEBRATED

ANIMALS. 12mo. Cloth, $2.50.

LAY SERMONS, ADDRESSES, AND REVIEWS. 12mo. Cloth, $1.75.

CRITIQUES AND ADDRESSES. 12mo. Cloth, $1.50.

AMERICAN ADDRESSES; WITH A LECTURE ON THE STUDY OF BIOLOGY. 12mo. Cloth, $1.25.

PHYSIOGRAPHY: AN INTRODUCTION TO THE STUDY OF NATURE. With Illustrations and Colored Plates. 12mo. Cloth, $2.50.

HUXLEY AND YOUMANS'S ELEMENTS OF PHYSIOLOGY AND HYGIENE. Bv T. H. Huxley and W. J. Yoomass. 12mo. Cloth, $1.50.

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JOHN TYNDALL'S WORKS.

ESSAYS ON THE FLOATING HATTER OF THE AIR,

in Relation to Putrefaction and Infection. 12mo. Cloth, $1.50.

ON FORMS OF WATER, in Clouds, Rivers, Ice and Glaciers

With 35 Illustrations. 12mo. Cloth, $1.50.

HEAT AS A MODE OF MOTION. New edition. l2mo. Cloth, $2.50.

ON SOUND: A Course of Eight Lectures delivered at the Royal Institution of Great Britain. Illustrated. 12mo. New edition. Cloth, $2.00.

FRAGMENTS OF SCIENCE FOR UNSCIENTIFIC PEOPLE. 12mo. New revised and enlarged edition. Cloth, $2.50.

LIGHT AND ELECTRICITY. 12mo. Cloth, $1.25.

LESSONS IN ELECTRICITY, 1875-*70. 12mo. Cloth, $1.00

HOURS OF EXERCISE IN THE ALPS. With Illustrations.

12mo. Cloth, $2.00.

FARADAY AS A DISCOVERER. A Memoir. 12mo. Cloth, $1.00.

CONTRIBUTIONS TO MOLECULAR PHYSICS in the Domain of Radiant Heat. $5.00.

SIX LECTURES ON LIGHT. Delivered in America in 1872'78. With an Appendix and numerous Illustrations. Cloth, $1.50.

FAREWELL BANQUET, given to Professor Tyndall, at Del. monico's, New York, February 4, 1878. Paper, 50 cents.

ADDRESS delivered before the British Association, assembled at Bel fast. Revised with Additions, by the author, since the Delivery 12mo. Paper, 50 cents.

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from the analogy of ordinary variations, that the successive, slight, profitable modifications did not first arise in all the neuters in the same nest, but in some few alone; and that by the survival of the communities with females which produced most neuters having the advantageous modification, all the neuters ultimately came to be thus characterised. According to this view we ought occasionally to find in the same nest neuter insects, presenting gradations of structure; and this we do find, even not rarely, considering how few neuter insects out of Europe have been carefully examined. Mr.F. Smith has shown that the neuters of several British ants differ surprisingly from each other in size and sometimes in colour; and that the extreme forms can be linked together by individuals taken out of the same nest: I have myself compared perfect gradations of this kind. It sometimes happens that the larger or the smaller sized workers are the most numerous; or that both large and small are numerous, whilst those of an intermediate size are scanty in numbers. Formica flava has larger and smaller workers, with some few of intermediate size; and, in this species, as Mr. F. Smith has observed, the larger workers have simple eyes (ocelli), which though small can be plainly distinguished, whereas the smaller workers have their ocelli rudimentary. Having carefully dissected several specimens of these workers, I can affirm that the eyes are far more rudimentary in the smaller workers than can be accounted for merely by their proportionally lesser size; and I fully believe, though I dare not assert so positively, that the workers of intermediate size have their ocelli in an exactly intermediate condition. So that here we have two bodies of sterile workers in the same nest, differing not only in

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