CHAP. X.] CONTINUITY OF THE CHALK. DOE 
organic matter in sea-water by the permanganate 
method, although there is every probability that 
the general result at which we arrived—that organic 
matter is contained in the water of the ocean in 
all localities and at all depths—is substantially true. 
The application of the exact methods of modern 
science to this lne of inquiry is new, -and it will 
require long and patient work to bring it to per- 
fection. The one real advance which has been made 
in this direction is the addition to the appliances for 
the investigation of the physics of the deep sea; of a 
correct and trustworthy instrument by which ocean 
temperatures can be ascertained to any depth with 
what may be regarded as absolute accuracy for all 
practical purposes. 
KUNO, FROM VAAY IN BORDO. 
