422 Anton Fr. Bruun and A. Kiilerich 



ievel of the surrounding basin. Lengthwise of the connection we found no depth 

 shallower than 6000 m. Therefore it might even be reasonable to speak of one trench 

 only, the Tonga-Kermadec Trench. The potential temperatures calculated are as 

 constant as could be expected from the quality of thermometers, just as in the Philip- 

 pine Trench. We want, however, to draw attention to the slight increase close to 

 the bottom. It is only 0-04° C, but it has been recorded on four occasions with two 

 different thermometers. This is the opposite of what was found by the SneUius 

 Expedition (van Riel, et al, 1950, 29-30); it will be most important to have this 

 disagreement further studied. As it is, it does not justify further comment. 



Table I 

 Values of temperature, salinity, density and oxygen at various depths as actually 



observed by the Galathea 



St. 412. Philippine Trench. iri3'N. 126° 21' E. 12-13/7 1951 



