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CONT Bans: 
CHAPTER I. 
INTRODUCTION. 
The Question of a Bathymetrical Limit to Life-—The general Laws which 
regulate the Geographical Distribution of Living Beings.—Professor 
Edward Forbes’ Investigations and Views.—Specific Centres.—Repre- 
sentative Species.—Zoological Provinces.—Bearings of a Doctrine of 
Evolution wpon the Idea of a ‘ Species, and of the Laws of Distribution. 
—The Circumstances most likely to affect Life at great Depths: Pres- 
sure, Temperature, and Absence of Light... . ... ... ... Page 1 
CHAPTER II. 
THE CRUISE OF THE ‘ LIGHTNING.’ 
Proposal to investigate the Conditions of the Bottom of the Sea.—Sugges- 
tions and Anticipations —Correspondence between the Council of the 
Royal Society and the Admiralty.—Departure from Stornoway.—The 
Féroe Islands.—Singular Temperature Results in the Froe Channel.— 
Life abundant at all Depths.—Brisinga coronata.—Holtenia carpentert. 
—General Results of the Expedition ... ... ... -- ... Page 49 
Apprenpix A.—Particulars of Depth, Temperature, and Position at the 
various Dredging Stations of H.M.S. ‘Lightning, in the Summer of 
1868 ; the Temperatures corrected for Pressure... ... .... Page 81 
CHAPTER III. 
THE CRUISES OF THE ‘ PORCUPINE.’ 
The Equipment of the Vessel.—The first Cruise, under the direction of Mr. 
Gwyn Jeffreys, off the West Coast of Ireland and in the Channel 
between Scotland and Rockall.—Dredging carried down to 1,470 fathoms. 
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