270 BOTANY OF THE 
farther north, and situated like the former on the sea board. We find 
as strong an analogy in the meteorological character of that portion of 
both continents which lies between the parellels of 40°-42° and 50°- 
52°, as in its animal and vegetable productions; and since these cli- 
matic relations "es doubtless much to do with determining the corre- 
sponding similarity in the type of vegetation just alluded to, some 
remarks on this head, as bearing closely on the main subject to which 
this Journal is devoted, will not, I trust, be here thought out of place. 
The same resemblance betwixt the cis-atlantie and trans-atlantie cli- 
mates of Europe and America, are distinetly traceable on the north and 
south of the parallels above mentioned ; but these have been selected as 
being those between which the climate of the United States coincides 
most nearly with that of England and the western part of central 
Europe generally. The regions they include are, indeed, to use the 
words of Dr. Forry,* * the battle ground on which Boreas and Auster 
are contending for the mastery," or, it may be called, the neutral terri- 
tory on which meet the attributes of the north and the south. 
The isothermal line of 51? Fah. has its convex summit in the west 
of Europe and its concave one in eastern America, on points pretty 
nearly coincident in both hemispheres betwixt their respective latitudes 
of 40°-42° and 50°-52°, and though the isocheimal and isotheral 
curves are not parallel to those of mean annual temperature, the 
general similarity betwixt these two systems of climate is not materi- 
ally affected by the discrepancy. We find in both the same uncertainty 
attendant on the setting in of the seasons, the same intercalation of 
cool and cloudy summers, and of mild open winters, with those of an 
opposite or medium character,—the same irregularity in the direction 
and duration of the winds, and in the extent and frequency of the 
oscillations of the barometrie column ; all that fickleness in short which 
the prevalence of various antagonist or disturbing forces is found to 
produce in the meteorological constitution of the atmosphere in coun- 
tries lying under the middle latitudes and in the vicinity of a boundless 
ocean. 
Among the popular fallacies relating to climate, which have been 
generally received as undisputed facts, there are two which I shall men- 
The Ay ari of the pins: canje and its Endemic Influences, by Samuel Forry, 
* 
M.D., Y work replete with curious and original matter and remarks, 
oy statistical, pi a 
