NOTE ON THE PLATES 



Plates XXVI-XXXI are collotype reproductions of selected sections of 

 sounding records, all reduced to one-half the original size. The order of 

 sounding is from left to right. In colour and intensity they approximate 

 to the originals, which vary a little in these respects. Reproduction has 

 involved a slight loss of contrast but virtually no loss of detail. Even 

 where the line of the sea floor becomes confused and lost, almost no details 

 can be seen in the originals which cannot be seen in the collotypes. 



