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CONTENTS.

Page.

Letter from the secretary submitting the annual report of the regents to

Congress......

Contents of the report..

List of plates...

iii

V

vii

The gyrostatic compass, by H. Marchand....

Radiotelegraphy, by G. Marconi.....

Multiplex telephony and telegraphy by means of electric waves guided by

wires, by George 0. Squier.....

Recent experiments with invisible light, by R. W. Wood..

What electrochemistry is accomplishing, by Joseph W. Richards.......

Ancient and modern views regarding the chemical elements, by William Ram-

say..

The fundamental properties of the elements, by Theodore William Richards....

The production and identification of artificial precious stones, by Noel Heaton.

The sterilization of drinking water by ultra-violet radiations, by Jules Cour-

mont.....

The legal time in various countries, by M. Philippot

Some recent interesting developments in astronomy, by J. S. Plaskett.

The age of the earth, by J. Joly.....

International air map and aeronautical marks, by Ch. Lallemand.

Geologic work of ants in tropical America, by J. C. Branner....

On the value of the fossil floras of the arctic regions as evidence of geological

climates, by A. G. Nathorst.....

Recent advances in our knowledge of the production of light by living organ-

isms, by F. Alex. McDermott...

Organic evolution: Darwinian and de Vriesian, by N. C. Macnamara..

Magnalia naturæ: or the greater problems of biology, by D'Arcy Wentworth

Thompson.....

A history of certain great horned owls, by Charles R. Keyes....

The passenger pigeon, by Pehr Kalm (1759), and John James Audubon (1831).

Note on the iridescent colors of birds and insects, by A. Mallock...

On the positions assumed by birds in flight, by Bentley Beetham.

The garden of serpents, Butantan, Brazil, by S. Pozzi....

Some useful native plants of New Mexico, by Paul C. Standley..

The tree ferns of North America, by William R. Maxon.....

The value of ancient Mexican manuscripts in the study of the general develop-

ment of writing, by Alfred M. Tozzer....

The discoverers of the art of iron manufacture, by W. Belck.

The Kabyles of north Africa, by A. Lissauer..

Chinese architecture and its relation to Chinese culture, by Ernst Boerschmann.

The Lolos of Kientchang, western China, by A. F. Legendre....

The physiology of sleep, by R. Legendre...

Profitable and fruitless lines of endeavor in public health work, by Edwin 0.

Jordan.....

Factory sanitation and efficiency, by C.-E. A. Winslow..

The physiological influence of ozone, by Leonard Hill and Martin Flack..

Traveling at high speeds on the surface of the earth and above it, by H. S.

Hele-Shaw....

Robert Koch, 1843–1910, by C. J. M..

Sir Joseph Dalton Hooker, 1817–1911, by Lieut.-Col. D. Prain..

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LIST OF PLATES.

Page.

Page. GROSTATIC COMPASS (Marchand):

NATIVE PLANTS OF NEW MEXICO
Plates 1-3.....

116 (Standley): RADIOTELEGRAPHY (Marconi):

Plates 1-13..

462 Plate 1.......

126 Tree FERNS (Maxon): MULTIPLEX TELEPHONY (Squier):

Plate l..

463 Plate 1.... 136 Plates 2-15..

492 EXPERIMENTS WITH INVISIBLE

MEXICAN MANUSCRIPTS (Tozzer): Light (Wood):

Plate l.....

496 Plates 1-2.... 160 Plates 2-5.....

498 Plates 3-4.

162 KABYLES OF NORTH AFRICA (Lis-
Plates 5-6..

164 sauer):
ARTIFICIAL
PRECIOUS
STONES
Plates 1, 2..

524 (Heaton):

Plates 3, 4.

528 Plate 1.. 220 Plates 5-8..

530 Plate 2.. 226 Plates 9-12.

532 Plate 3.

230 CHINESE ARCHITECTURE (BoerschLEGAL TIME (Philippot):

mann):
Plate 1 (colored map)......... 254 Plates 1, 2..

548 GEOLOGIC WORK OF ANTS (Bran

Plates 3, 4.

554 ner):

Plates 5, 6...

558 Plate l...... 314 Plates 7,8.

562 GREAT HORNED Owls (Keyes):

Plates 9, 10......

564 Plates 1-8.......

406 Lolos OF KIENTCHANG (Legendre): PASSENGER PIGEON (Kalm and

Plates 1, 2......

572 Audubon):

Plates 3, 4..

576 Plate 1 (colored half-tone).... 424 Robert Koch (C. J. M.): COLORS OF BIRDS AND INSECTS

Plate 1......

651 (Mallock):

SIR JOSEPH DALTON IIOOKER
Plates 1-3.......

432 (Prain); BIRDS IN Flight (Beetham):

Plate 1..

659 Plates 1-8...

440

VII

ANNUAL REPORT OF THE BOARD OF REGENTS OF THE SMITHSONIAN INSTITUTION FOR THE YEAR ENDING JUNE 30, 1911,

SUBJECTS.

1. Annual report of the secretary, giving an account of the operations and conditions of the Institution for the year ending June 30, 1911, with statistics of exchanges, etc.

2. Report of the executive committee, exhibiting the financial affairs of the Institution, including a statement of the Smithsonian fund, and receipts and expenditures for the year ending June 30, 1911.

3. Proceedings of the Board of Regents for the sessions of December 8, 1910, and February 9, 1911.

4. General appendix, comprising a selection of miscellaneous memoirs of interest to collaborators and correspondents of the Institution, teachers, and others engaged in the promotion of knowledge.' These memoirs relate chiefly to the calendar year 1911.

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