rial and make all the calculations ; and this too I have a 
‘to do for the observations in Northern Asia. 
112 On the Distribution of Rain in the Temperate Zone. 
Arr. XVI.—On the ig of Ham in the Pangea t 
Zone ; by H. W. D 
Continued from page 397. 
Ir is now clear that if the Trade Wind has unchanging limits, 
all places within its range are either continually within it, or about 
its inner limits, or lying just beyond these limits. The first 
would be rainless ; while over the second and third, for the whole 
year through, there would be rains. If the characteristic of the 
Subtropical zone is the change from a rainless season at the time 
of the sun’s highest ascension, to a heavy fall of water at its low- 
est, there will be no Subtropical zone on the outer limits of the 
constant Trade Wind. If in America there is any approach to 
such Sa acuta the consequences stated will gfodasily 
be prov 
On this account I have long been anxious to ascertain ‘the dis- 
tribution of rain in the parts of Asia and America on the extreme 
limits of the Tropics, where the conditions of wind currents and 
barometric heights are very different from those in Europe. Since | 
however the quantity of rain, taking only a few years together, | 
would seem to vary much, I have been compelled to wait until | 
the observations covered a ‘longer period. Except a few stations q 
taken from that excellent work, “ Drake’s Systematic Treatise; 
jseases 
Caucasian, African, Indian and Esquimaux varieties of i 
lation: Cincinnati, 1850,” I have had to collect the who 
~ Going from the south point of Florida, Key West and 
Key, first, westwardly to the North coast of the Gulf of Me 
to the mouth of the Mississippi, past New Orleans, Natches, 
Vicksburg, to St. Louis, and past Fort Crawford to the Falls 
St. Anthony on the parallel of 45°, hear Fort Snelling, then 
the west coast of the interior valley by Forts ts Jessup, Towso 
Smith, Gibson, Leavenworth, to the north, there is nowhere 
trace of the conditions required by a Subtropie. Only on | 
lower Florida Keys there falls in winter somewhat more 
than in simmer ; but t from the north. coast of the Gulf of 
ico on, fully nine degrees mote. to the — than Algiers, this 
nowhere the case 
The | wantity of rain in the 
irregularly divided, that we mu 
servations, to deduce safely any rules. 
see that on going to the north, t 
diminishes at the ex xpense of t 
