14<34 
THE V()YA(iE OK H.M.S. CHALLENGER. 
sented. The Dingnuns show the isotherms for every five degrees, which were obtained by plotting the 
temperature observations on paper of etpial squares and drawing the curves (the observations and curves 
are j)ublislicd as Part III. of the Physics and Chemistry of the Expedition). 
In tlie Diagrams tlie thick Horizontal Hues represent lines of equal temperature in Fahrenheit 
CD 
Scale. The figures above each Vertical line, thus, , indicate, (^ 3 ?), the number of the 
in 
CO 
eg 
Station, 68 , the Surface Temperature, and, 2650, the Depth in fathoms. The figures below 
each Vertical line indicate the temperature at the P>ottom, the type of Deposit being 
given witli the percentage of Carbonate of Lime underneath. 
Examisi.vc f'oNTK.vrs OK Thawi,. 
