29 BULLETIN OF THE BUSSEY INSTITUTION. 
the amount of material at my disposal was insufficient for the estima- 
tion of this substance. 
The results of the analyses were as follows : — 
No. 17.* No. 12, No.8 No.4. No.6. No.1. No.3. 
Silica (and sand) . .51.10 49.52 65.61 68.63 60.60 70.66 74.82 
Alumina (manganese) 
and ferric oxide . . 7.75 8.82 14.91 14.40 19.01 16.58 12.41 
Lime“. . «3. £18.76 17.08. 1.89 1.68 27 ee 
Magnesia. . . . . 1:78'1:77 © 8,29 2.58 | “GO oe 
Phosphoric acid . . ..0.32, 0.19 1.96 0.66 1.80 :0;pRuge 
Potash. . . . . . 5.29 2.12 -—— 213 — 4.06 2.68 
Samples Nos. 12 and 17, obtained broad off the coast of Nova Scotia 
at or near the northern edge of the Gulf Stream, are rich in lime, and are 
akin in this respect to specimens from the more southern portions of 
the Atlanticcoast. ‘The other samples analyzed contain comparatively 
little lime. They were obtained by Lieutenant Brooke in the Pacific 
Ocean between California and China, in the track of the equatorial 
and North Pacific currents. No. 8, brought up from a depth of 
2400 fathoms broad off the coast of California, contained 1.389% of 
lime; No. 4, from 2500 fathoms in mid-ocean east of the Sandwich 
Islands, contained 1.68% of lime; No. 6, from 2600 fathoms, nearer 
the Islands, contained nearly twice as much lime, viz., 2.74% ; No. 1, 
from 3000 fathoms between the Phillipine and Ladrone Islands, con- 
tained 1.71% of lime; and No. 3, from 900 fathoms in the China Sea, 
southwest of the island of Formosa, contained 2.52% of lime. 
The proportion of lime in the Pacific muds, though small, is still 
much larger than that found in the Chemung shales, which, as was 
_* The samples came to me marked as follows : — 
No. 17. Berryman, 1857. Depth, 1298 fathoms. Lat. 42° 57/40.” Long. 
60° 04./ 
No. 12. Berryman, 1857. Depth, 1076 fathoms. Lat. 42° 55/18.” Long. 
638° 26/ 35/. 
No. 8. Brooke, Oct. 38, 1858. Depth, 2400 fathoms. Lat. 31° 06/N. Long. 
129° 49/ W. 
No. 4. Brooke, Oct. 80, 1858. Depth, 2500 fathoms. Lat. 21° N. Long. 
144° 25/ W. 
No. 6. Brooke, Nov. 4. 1858. Depth, 2600 fathoms. Lat. 20° 52/N. Long. 
151° 51/ W. 
No.1. Brooke, May 10, 1859. Depth, 3000 fathoms. Lat. 18° 08’ N. Long. 
129° 33/ E. 
No. 8. Brooke, May 16, 1859. Depth, 900 fathoms. Lat. 21° 52/N. Long. 
119° 24’ KE. 
