SOUNDING

THE OCEAN OF AIR

BEING SIX LECTURES

DELIVERED BEFORE THE LOWELL INSTITUTE OF BOSTON
IN DECEMBER 1898

BY

A. LAWRENCE ROTCH, S.B., A.M.,
DIRECTOR OF The Blue Hill Meteorological obsERVATORY,

"

MASSACHUSETTS, U.S.A., AND MEMBER

OF THE INTERNATIONAL CLOUD AND AERONAUTICAL COMMITTEES.

PUBLISHED UNDER THE DIRECTION OF THE General
LITERATURE COMMITTEE.

LONDON:

SOCIETY FOR PROMOTING CHRISTIAN KNOWLEDGE,
NORTHUMBERLAND AVENUE, W.C.; 43, QUEEN VICTORIA STREET, E.C.
BRIGHTON: 129, North Street.

NEW YORK: E. & J. B. YOUNG & CO.

1900

10879

This little Book is gratefully Dedicated

ΤΟ

THE LATE AUGUSTUS LOWELL, Esq.

OF

BOSTON, U.S.A.

WHO, AS TRUSTEE OF THE LOWELL INSTITUTE,

ENABLED SCIENTIFIC MEN OF TWO CONTINENTS TO

PRESENT THE RESULTS OF THEIR INVESTIGATIONS

TO THE PUBLIC

II. CLOUDS-FORMATION AND CLASSIFICATION-

MEASUREMENTS AT BLUE HILL-THE IN-

TERNATIONAL OBSERVATIONS

38

V.

VI.

KITES-HISTORY AND APPLICATION TO ME-

TEOROLOGICAL PURPOSES AT BLUE HILL