40 Scientific Works published by Longmans, Green, & Co. 

THE LONDON SCIENCE CLASS-BOOKS. 
Edited by G. Carry Foster, F.R.S., and by Sir PHrt1p Macnus, B.Sc., B. Ay 5 
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ASTRONOMY. By Sir ROBERT STA- 
WELL BALL, Ia. Ds, F.RsS) With 
41 Diagrams. Fcp. 8vo., 15. 6d. 
MECHANICS. By SiR ROBERT STA- 
WELLE, BALL, lL. By Res. 9) With 
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THE LAWS OF HEALTH. By W. 
H. CorFIELD, M A., M.D., F.R.C.P. 
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MOLECULAR PHYSICS AND 
SOUND. By FREDERICK GUTHRIE, 
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GEOMETRY, CONGRUENT  FIG- 
URES. O. HENRICI, Ph.D., 
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ZOOLOGY OF THE INVERTE- 
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ZOOLOGY OF THE VERTEBRATE 
ANIMALS. By ALEXANDER MAC- 
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HYDROSTATICS AND PNEUMA- 
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with Answers, 2s.) The Worked 
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BOTANY. Outlines of the Classification 
of Plants. By W. R. McCNaAs, M.D. ~ 
With 118 Diagrams. Fep. 8vo., 15. 6d. 
BOTANY. Outlines of Morphology and 
Physiology. By W. R. McNAs, 
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THERMODYNAMICS. By RICHARD — 
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PRACTICAL ELEMENTARY SCIENCE SERIES. 
ELEMENTARY PRACTICAL PHY- 
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JOHN THORNTON, M.A. With 215 
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ELEMENTARY PRACTICAL PHY- 
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PRACTICAL DOMESTIC HYGIENE. 
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A PRACTICAL INTRODUCTION 
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ELEMENTARY PRACTICAL HY- 
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ELEMENTARY PRA CEICAL 
SOUND, LIGHT, AND HEAT. 
By JosEPH S. DEXTER. With 152 
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PRACTICAL MATHEMATICS. By © 
A. G. CRACKNELL, M.A., B.Se. 
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ELEMENTARY PRACTICAL CHE- 
MISTRY. By G.S. NEWTH, F.I.C., 
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254 Experiments. Crown 8vo., 2s. 6d. 
ELEMENTARY PRACTICAL PHY- 
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ELEMENTARY BIOLOGY. By JOHN 
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THE ELEMENTS OF GEOMET- 
RICAL DRAWING : an Elementary 
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metry, including an Introduction to 
Solid Geometry. By HENRY J. 
SPOONER, C.E., M.Inst.M.E. Crown 
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