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LONDON, EDINBURGH, AND DUBLIN

PHILOSOPHICAL MAGAZINI

AND

JOURNAL OF SCIENCE.

CONDUCTED BY

SIR ROBERT KANE, LL.D. F.R.S. M.R.I.A. F.C.S. SIR WILLIAM THOMSON, KNT. LL.D. F.R.S. &c.

AND

WILLIAM FRANCIS, PA.D. F.L.S. F.R.A.S. F.C.S.

“Nec aranearum sane textus ideo melior quia ex se fila gignunt, nec noster vilior quia ex alienis libamus ut apes.” Just. Lips. Polit. lib. i. cap. 1. Not.

VOL. XLIX.-FOURTH SERIES,

JANUARY-JUNE 1875,

LONDON

TAYLOR AND FRANCIS, RED LION COURT, FLEET STREET,

Printers and Publishers to the University of London ; SOLD BY LONGMANS, GREEN, READER, AND DYER; KENT AND CO.; SIMPKIN, MARSHALL AND CO.; AND WHITTAKER AND CO.;—AND BY ADAM AND CHARLES BLACK, AND THOMAS CLARK, EDINBURGH ; SMITH AND SON, GLASGOW HODGES, FOSTER, AND CO, DUBLIN:—PUTNAM, NEW

YORK: AND ASHER AND CO., BERLIN,

LONDON, EDINBURGH, AND DUBLIN

PHILOSOPHICAL MAGAZINE

AND

JOURNAL OF SCIENCE.

CONDUCTED BY

SIR ROBERT KANE, LL.D. F.R.S. M.R.I.A. F.C.S.
SIR WILLIAM THOMSON, KNT. LL.D. F.R.S. &c.

AND

WILLIAM FRANCIS, PH.D. F.L.S. F.R.A.S. F.C.S.

“Nec aranearum sane textus ideo melior quia ex se fila gignunt, nec noster
vilior quia ex alienis libamus ut apes." Just. Lips. Polit. lib. i. cap. 1. Not.

VOL. XLIX.-FOURTH SERIES.

JANUARY-JUNE 1875.

LONDON.

TAYLOR AND FRANCIS, RED LION COURT, FLEET STREET,

Printers and Publishers to the University of London ;
SOLD BY LONGMANS, GREEN, READER, AND DYER; KENT AND CO.; SIMPKIN, MARSHALL,
AND CO.; AND WHITTAKER AND CO. ;-—AND BY ADAM AND CHARLES BLACK,
AND THOMAS CLARK, EDINBURGH ; SMITH AND SON, GLASGOW:
HODGES, FOSTER, AND CO, DUBLIN:PUTNAM, NEW

YORK: AND ASHER AND CO., BERLIN.

Meditationis est perscrutari occulta; contemplationis est admirari perspicua ..... Admiratio generat quæstionem, quæstio investigationem, investigatio inventionem.”-Hugo de S. Victore.

“Cur spirent venti, cur terra dehiscat,
Cur mare turgescat, pelago cur tantus amaror,
Cur caput obscura Phæbus ferrugine condat,
Quid toties diros cogat flagrare cometas;
Quid pariat nubes, veniant cur fulmina cælo,
Quo micet igne Iris, superos quis conciat orbes
Tam vario motu."

J. B. Pinelli ad Mazonium.

CONTENTS OF VOL. XLIX.

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