CONTENTS:-Our Boys at School-Mysteries and Moralities-Our Household Insects-Notes on Mapping-Statistics of Great CountriesWatchmaking at the Inventions Exhibition-Gossip-Face of the Sky-Correspondence-Chess.

KNOWLED

AN ILLUSTRATED

MAGAZINE OF SCIENCE

PLAINLY WORDED-EXACTLY DESCRIBED

PATENT INSTANTANEOUS

exposures. Entirely under control. Smallest made. MPROVED SENSITISED PAPER.

Per sheet 1s., or ready cut, sufficient for 42 C.D.V., 15 Cabinets, or 10 half-plates, 1s. 1d., post free.

NEW RAPID" POSITIVE PAPER,

for printing by artificial light, 50 pieces C.D.V., 1s. 2d. ; 24 cabinets, ls. 8d.; or whole sheet, Is. 2d. post free.

New Illustrated Price list post free 1 stamp.
STANLEY, MANUFACTURER,
Railway Approach, London Bridge, 8.E.

Arranged by H. G. MADAN, M.A. Large 4to.,
paper covers, 4s. 6d.

Text-Book of Botany, Morpho-
LOGICAL and PHYSIOLOGICAL. By Dr.
JULIUS SACHS, Professor of Botany in the Uni-
versity of Wurzburg. Second Edition. Edited,
with an Appendix, by S. H. VINES, M.A., Fellow
and Lecturer of Christ's College, Cambridge.
Royal 8vo., half-morocco, £1. 11s. 6d.
Comparative Anatomy of the

VEGETATIVE ORGANS of the PHANERO-
GAMS and FERNS. By Dr. A. DE BARY.
Translated and Annotated by F. O. BOWER, M.A.,
F.L.S., and D. H. SCOTT, M.A., Ph.D., F.L.S.
Royal 8vo., 22s. 6d.

"Must call for enthusiastic praise from all compe-
tent botanists."-Athenæum.
A Treatise on Rivers & Canals,
relating to the Control and Improvement of Rivers,
and the Design, Construction, and Development
of Canals. By L. F. VERNON HARCOURT, M.A.,
M.I C.E. 2 vols. (Vol. I., Text; Vol. II., Plates),
Svo., 218.

DR. MARTINEAU'S NEW BOOK.

Types of Ethical Theory. By
JAMES MARTINEAU, D.D., LL.D., Principal of
Manchester New College, London. 2 vols., demy
8vo., cloth, 24s.

"A more important contribution to the science of
ethics has not been made by any living writer."-St.
James's Gazette.

London: HENRY FROWDE, Clarendon Press
Warehouse, Amen-corner, E.C.

3 6

20

16

Very Beautiful newly-prepared Botanical slides
Mezgeria furcata-showing chlorophyll........... 1 0
Yeast plant-Torula cerevesiæ

Spirogyra nitida in conjugation-stained
Volvox Globator

10

16

1 6

1 0

New Classified List of Objects, including the recently acquired stock of Mr. WHEELER, late of Holloway.

Illustrated Catalogue of Microscopes and Apparatus.

Either of the above sent post free to any part of the world on application to W. WATSON & SONS, Opticians to Her Majesty's Government, 313, High Holborn, London, W.C. Established 1837.

MEMORY & SUCCESS.

WHAT IS IT THAT contributes greatly to success?

A good memory.

WHAT, THAT is indispensable to every
Student, Speaker, Professional and Business
Man?
A good memory.
WE
WHAT IS IT THAT every one can obtain from
PROFESSOR LOISETTE? A good memory-the
Physiological Art of Never Forgetting-wholly unlike
Mnemonics. Any book whatever mastered in one
reading.

Prospectus post free, giving opinions of Mr. RICHARD A. PROCTOR, Dr. ANDREW WILSON, and others who have studied the system.

Great inducements to Correspondence Classes in all parts of the world.

Day and Evening Classes in "Never Forgetting," and for Cure of "Mind-Wandering."

PROFESSOR LOISETTE,

37, New Oxford-street, London.