316 On an Isothermal Oceanic Chart, illustrating 
Atlantic Frigid Regions, beyond 35° F.—Greenland, Iceland, 
and Norway are within the northern of these regions, and the 
South Shetlands, Sandwich Land, and South Georgia, within the 
southern. 
Pacific Regions.—A comparison of the regions of the Atlantic 
and Pacific, and especially of the limits of those commencing at 
the South American coasts, brings out some singular facts. 
The Torrid region of the Pacific, near the American coast, em- 
braces only seventeen and a half or eighteen degrees of latitude, 
all but one of which are north of the equator; while that of the 
Atlantic covers a long range of coast, and reaches to 15° south. 
The south Subtorrid Region has a breadth of about three degrees 
on the Peruvian coast, reaching to 4° south, or probably to Cape 
Blanco, while that of the Atlantic extends to Rio Janeiro, in 24° 
south. The Warm Temperate Region, if at all found north of 
Cape Blanco, 43° S., hasa breadth of less than a degree, while that 
of the Atlantic extends to Rio Grande, in 33° south. The next 
or Temperate Region has a longer range on the South American 
coast, extending to Copiapo, in 274° south, and the Atlantic region 
corresponding goes to Maldonado in 35° south. The Cold T'em- 
perate Regions of the two oceans cover nearly the same latitudes. 
On the North American coast at Cape Hatteras, the three iso- 
crymes 62°, 56°, and 50° F’., leave the coast together; and in 
the Pacific on the South American coast there isa similar node in 
the system of isocrymes, the three 74°, 68°, and 62°, proceeding 
nearly together from the vicinity of Cape Blanco. 
Viewing these regions through the two oceans, instead of along 
the coasts, other peculiarities no less remarkable are brought out. 
The average breadth of the South Torrid Region in the Pacific, 
is more than twice as great as that of the same in the Atlantic ; 
and the most southern limit of the latter is five degrees short 0 
the limit of the former in mid-ocean. So also, the Subtorrid 
Region at its greatest elongation southward in the Atlantic, hardly 
extends beyond the mean course of the line of 68° F. in the 
Pacific, and the average breadth of the former is but two-thirds 
that of the latter. The same is true to an almost equal extent of 
the Warm Temperate and Temperate Regions. 
The breadth of the Torrid Region of the Pacific to the east- 
ward, where narrowest, is about six degrees ; and to the west- 
ward, between its extreme limits, forty-nine degrees. The Tor- 
rid zone or Coral-reef Seas, in the same ocean, has a breadth near 
America, of about eighteen degrees, and near Australia and Asia, 
of sixty-six degrees. 
New Zealand lies within the Subtemperate and Cold Tem- 
perate Regions, excepting its southern portion, which appears to 
pertain like Fuegia to the Subfrigid. Van Diemens Land, ex- 
elusive of its northern shores, is within the Cold Temperate. 
