S pecific Gravity of Sea Water 
INDEX. 
above 1-0280. 
between 1-0275 and 1-0280 
1 0275 
1-0270 
1-0270 
1-0265 
1-0265 
1-0260 
1 0260 
1 0250. 1-0255 
1-0250. 
TRACK 
H M S CHALLENGER 
mm 
