THE VOYAGE OF H.M.S. CHALLENGER. 
which have been used in constructing the diagrammatic sections of the ocean basins to 
illustrate the distribution of temperature with depth in different parts of the ocean. 
These diagrammatic sections will be published in Vol. I. of the Narrative of the Cruise. 
The observations of the temperature of the surface of the sea, taken at least every 
two hours during the cruise, have been published in extenso, along with the meteorological 
observations. 1 
For convenience of reference, series of tables, arranged by Staff-Commander Tizard, 
R.N., are appended to the plates, in which the serial temperatures for the four different 
oceans have been grouped and averaged according to latitude. Miscellaneous tempera- 
tures are given in Table V. ; in Table VI. the observations are summarised in 5° belts of 
latitude for each of the four oceans ; and Table VII. includes all temperatures obtained 
between the depth of 1500 fathoms and the bottom. 
In certain cases it was thought that the form of the curve would be more clearly 
shown if magnified ten times horizontally, and accordingly, in some diagrams, each 
larger division of the scale has been taken to represent 10 instead of 100 fathoms. Of 
this PI. II. is an example ; and in all cases where this has been done a stroke has been 
drawn through the last cipher of the numbers indicating the fathoms. 
Where two curves are shown on the same plate, one of them (generally the longer 
one) represents the whole depth plotted in the usual manner, while the other represents 
the temperatures of the upper portion of the section plotted in a curve on the larger 
scale. The curves on PI. X. are examples. 
A Report on the Composition of Ocean- Water, by Professor W. Dittmar, F.R.S., 2 and 
a Report on the Specific Gravity of Ocean-Water by Mr. J. Y. Buchanan 3 form Parts 
I. and II. of this volume; and a discussion of the meteorological observations and deep- 
sea temperatures and specific gravity in their bearings on ocean circulation is in course 
of preparation by Professor P. G. Tait and Mr. Alexander Buchan. 
John Murray. 
1 Nar. Chall. Exp., vol. ii. 2 Phys. Chem. Cball. Exp., part i. 3 Phys. Chem. Cliall. Exp., part ii. 
ERRATA. 
PI. LXXX., for “Tristan d’Acuhna,” read “Tristan da Cunha.” 
PI. CCXXIV., for “ Magalhasas,” read “Magcllans.” 
PI. CCL, at end of footnote, for “corrected Thermometer,” read “corrected Temperature.” 
