186 
Proceedings of the Royal Society of Edinburgh. [Sess. 
barium, were left out of account. Furthermore, since a great wealth of 
material was generously placed at disposal by Sir John Murray out of his 
unique collection of deep-sea deposits, the opportunity was taken of choos- 
ing a highly representative series of Red Clays from all parts of the ocean. 
For the specimens numbered 12 and 13 I am indebted to the kindness of 
Dr Emil Philippi. 
The subjoined list of Red Clays analysed gives topographical, bathy- 
metrical, and other particulars, together with the associated species of 
coarse minerals, as determined by the original investigators of the deposits. 
The proportion of these minerals separable by elutriation is in all cases in- 
significant and well under 1 per cent. Grains of manganese peroxide were 
usually reported as present in the coarse washings. 
Depth 
(fathoms). 
Locality. 
Minerals. 
North Atlantic. 
1 . 
Challenger Station 9 
3150 
23°23'N.; 35°11'W., 
Felspar, magnetite, 
(trawl). 
about 800 miles 
biotite, augite, 
N.W. of Cape 
pumice, quartz. 
Verde Islands. 
2. 
Challenger Station 13 
1900 
21°38'N. ; 44° 39' W., 
Lapilli, sanidine, 
(trawl) : residue from 
about 1200 miles 
augite, magnetite, 
a Glob. Ooze of 74 
W.N.W. of Cape 
palagonite, vol- 
per cent. CaC0 3 . 
Verde Islands. 
canic glass. 
South Atlantic. 
3. 
Seine Station 33. 
2815 
17°16'S.; 23° 10' W., 
Glassy particles. 
about 1000 miles 
due E. of Porto 
Seguro (Brazil). 
North 
Pacific. 
4. 
Challenger Station 256 S 
2950 
30° 22' N. ; 154° 33' 
Eelspar, volcanic 
(trawl). 
W., about 600 
glass, biotite, horn- 
miles due N. of 
blende, magnetite, 
Sandwich Islands. 
palagonite. 
5. 
Albatross Station 2 
2368 
28° 23' N. ; 126° 57' 
Felspar (orthoclase 
(trawl). 
W., about 450 
and plagioclase), 
miles due W. of 
volcanic glass, aug- 
Guadalupe Island. 
ite, palagonite. 
6. 
Challenger Station 244 
2900 
35° 22' N. ; 169° 53' 
Felspar, sanidine, 
(trawl). 
E., about 1800 
pumice, magnetite, 
miles due E. of 
cosmic spherules. 
Yokohama. 
7. 
Challenger Station 227. 
2475 
17° 29' N. ; 141° 21/ 
Pumice, volcanic 
E., about 300 miles 
glass, plagioclase, 
W. of the Ladrones. 
felspar, augite, 
hornblende, mag- 
netite. 
