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NEW DEVELOPMENT IN ATWOOD'S MACHINES

An Accurate Machine for £2:0:0

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BECKER,
Hatton Wall,
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PHOENIX

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19 LOMBARD ST., E.C., and 57 CHARING CROSS, S. W. ESTABLISHED 1782.

Absolute Security.

Electric
Moderate Rates.
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LOSSES PAID OVER £28,000,000.

THE IRISH NATURALIST.

A Monthly Magazine of Irish Zoology, Botany, and
Geology. Price 6d.

Edited by GEO. H. CARPENTER, B.Sc., and R. LLOYD
PRAEGER, B.A.

Annual Subscription, 5s. Post Free to any Address. Dublin: EASON & SON, LTD., 40 Lower Sackville Street (to which Address Subscriptions should be sent).

London: SIMPKIN, MARSHALL, HAMILTON, KENT & CO., Ltd.

Mecker
Bunsen Burner

(A WONDERFUL INVENTION).
BECKER,
Hatton Wall,
LONDON.

MACMILLAN & CO.'S NEW BOOKS.

FOURTH EDITION NOW READY.

THE SCENERY OF SWITZERLAND AND THE CAUSES TO WHICH IT IS DUE.

By the Rt. Hon. LORD AVEBURY, P.C.

Illustrated.

THIRD EDITION NOW READY.

Crown 8vo.

65.

THE CASES OF THE ATMOSPHERE: THE HISTORY OF THEIR DISCOVERY.

By SIR WILLIAM RAMSAY, K.C. B., F.R.S. Extra Crown 8vo. 6s. net.

PRACTICAL EXERCISES IN CHEMISTRY.

By G. C. DONINGTON, M. A., Senior Science Master of Leeds Grammar School. Globe 8vo.

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All the subjects included in the new syllabus in Chemistry for the Matriculation Examination of the University of London are dealt with in this book. CHEMICAL NEWS.--“It is undoubtedly one of the best of its kind that we have come across, and can be thoroughly recommended."

THE THEORY OF DETERMINANTS IN THE HISTORICAL ORDER
OF DEVELOPMENT.
Part I. (Second Edition): General Determinants up to 1841.
By THOMAS MUIR, C. M.G., M.A., LL.D., F.R.S.
Part II. Special Determinants up to 1841. 8vo.

A MANUAL OF GEOMETRY.

at Eton College. Crown 8vo. 3s. 6d.

17s. net.

By W. D. EGGAR, M.A., Assistant-Master

THE BEGINNER'S SET OF MATHEMATICAL INSTRUMENTS.

Bow Compass; Dividers; Two Nickel Set Squares, 45° (4 inches) and 60° (5 inches); Nickel Protractor; 6-inch Rule, double bevelled, inches and millimetres; and a Lead Pencil, in Metal Pocket-Case.

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NEW DOUBLE

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NATURE says:-"This is one of the most com. pact and efficient condensers which has come before our notice. We have tested it for condensing such volatile substances as ether, carbon disulphide, and acetone, and have found that even with rapid distillation the condensation is very complete. Generally speaking, in order to condense these substances satisfactorily, it is necessary to employ a very long condenser; of course, this means using a great amount of bench space. As the new condensers are used in a perpendicular position, the saving in space is very great.'

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Dr. HAMPSON'S AIR-LIQUEFIER is now made to a standard pattern, and numbers are in use in University Laboratories and elsewhere in various countries. The whole apparatus is neat and compact and its parts very easily moved; the Liquefier, without stand, being a cylinder 17 inches high and 8 inches in diameter.

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81 TOTTENHAM COURT ROAD, hour.

LONDON.

PARALLEL BOW COMPASS

HARLING

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This compass is so designed that whatever the size of the circle to be drawn (within, of course, the limits of the instrument) both nibs of the pen will always touch the paper, so that circles of different radii may be drawn 27/8 with the same thickness of line.

Parallel Compass Pen, with plain point, size 2 ins., over all, including handle, 6/6. If fitted with adjustable nut and bolt needlepoint, 7/6.

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It requires no auxiliary refrigerant and produces a perfectly clear liquid which requires no filtering.

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CHEMICAL APPARATUS.

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EIGHTH EDITION (1906), Revised and Enlarged,
Crown 8vo, 10s. 6d

AN ELEMENTARY TREATISE ON THE
INTEGRAL CALCULUS.

Containing Applications to Plane Curves and Surfaces,
and also Chapters on the Calculus of Variations,
with numerous Examples.

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LONCMANS, CREEN & CO., 39 PATERNOSTER ROW, LONDON, E.C.

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PLANT RESPONSE AS A MEANS OF
PHYSIOLOGICAL INVESTIGATION.

By JAGADIS CHUNDER BOSE,
C.I.E., M.A. (Cantab.), D.Sc. (Lond.), Professor, Presidency
College, Calcutta.

AUTHOR OF

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Price 21s.

In this volume Professor Bose gives an account of the investigations by which he has shown that all the importar: characteristics of the responses exhibited by animal tissues are also to be found in those of the plant. Further, he has attempted to show that the plant may be regarded as a machine, and that its movements in response to external stimuli are reducible to a fundamental unity of reaction. His experiments on plant move ments have enabled him to distinguish between the effects of internal energy and external stimulus, and to disentangle the complex phenomena which result from their combined action. All his experiments tend to show that the phenomenon of life does not connote any intrusion into the realm of the organic world of a force which would interfere with the law of Conser vation of Energy.

The known aspects of plant movements, the treatment of which is to be found in standard works on Physiology, are not dealt with in this book.

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