CHAP. X.] 



CONTINUITY OF THE CHALK. 



501 



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 line of inquiry is new, and it will 

 require long and patient work to bring it to per- 

 fection. The one real advance whicli 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 aoy depth with 

 what may be regarded as absolute accuracy for all 

 practical purposes. 



KUKO, PROM VAAY IN BOhDn. 



