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LETTER

FROM THE

SECRETARY OF THE SMITHSONIAN INSTITUTION

SUBMITTING

THE ANNUAL REPORT OF THE BOARD OF REGENTS OF THE

INSTITUTION FOR THE YEAR ENDING JUNE 30, 1921.

SMITHSONIAN INSTITUTION,

Washington, April 18, 1922. To the Congress of the United States:

In accordance with section 5593 of the Revised Statutes of the United States, I have the honor, in behalf of the Board of Regents, to submit to Congress the annual report of the operations, expenditures, and condition of the Smithsonian Institution for the year ending June 30, 1921. I have the honor to be, Very respectfully, your obedient servant,

CHARLES D. WALCOTT,

Secretary.

III

CONTENTS.

Page

III

Letter from the secretary, submitting the annual report of the Regents

to Congress---

Contents of the report--

List of plates---

General subjects of the annual report---
Officials of the institution and its branches__

VIII

IX

325

335

317

way

The historic development of the evolutionary idea, by Branislav Pet-

ronievics

The heredity of acquired characters, by L. Cuénot_

Breeding habits, development, and birth of the opossum, by Carl Hartman_

Some preliminary remarks on the velocity of migratory flight among

birds, with special reference to the Palæarctic region, by R. Meinertz-

hagen ----

A botanical reconnaissance in southeastern Asia, by A. S. Hitchcock----

Ant acacias and acacia ants of Mexico and Central America, by W. E.

Safford ---

The fall webworm, by R. E. Snodgrass_-

Collecting insects on Mount Rainier, by A. L. Melander.

The science of man: Its needs and its prospects, by Karl Pearson -

Pigmentation in the old Americans, with notes on graying and loss of

hair, by Aleš Hrdlička -----

Ancestor worship of the Hopi Indians, by J. Walter Fewkes.

The Indian in literature, by Herman F. C. Ten Kate.

Leopard-men in the Naga Hills, by J. H. Hutton.-

A new era in Palestine exploration, by Elihu Grant-

The alimentary education of children, by Marcel Labbé.

A 50-year sketch-history of medical entomology, L. 0. Howard

Laid and wove, by Dard Hunter_..-

Lead, by Carl W. Mitman..

William Crawford Gorgas, by Robert E. Noble.

365

373

381

395

415

423

443

485

507

529

541

549

565

587

595

615

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