354 Buysman—Sea and Continental Climates 
the right the amount of the translation of a sheet will decrease 
with increase of its distance from the upper surface M N, an 
thus the edges will form a curved surface. 
If it is important to show approximately the character of the 
curve, an equation is easily deduced after making certain 
assumptions. Let it be assumed: 
1st. That the diminution in thickness at a given point of the 
sheet, due to compression, is proportional to the applied normal 
tance x from the center of curvature of the contact surface be- 
tween the cylinder and the upper sheet. 
It will follow then, if ¢ and C are constants and p represents 
the pressure per unit of area, that p=— and since y is propor- 
¢ 
tional to p, ae 
The curve then will approximate in character an equilateral 
hyperbola, having A B and D E for asymptotes. 
It is only claimed that the assumptions made are near enough 
to the truth to lead to a reasonably good conception of the 
character of the curve formed. 
Art. XLITI.— The Difference between Sea and Continental Olimate 
with regard to Vegetation; by Mr. Buysman, of Flushing 
(Vlissingen), Holland. 
rees. 
Pinus sylvestris L. Scotch Pine. Scotland, 59°. Norway, 
70° 20’. Kola, 69°. Petschora region, 67° 15’. Obi river, 66°. 
Turuchansk, 65°. The Werchojansk mountains, east of the 
Lena river (64°), are the eastern limits of this tree.’ 
1 Middendorff, Sibirische Reise, Bd. IV, Th. I, p. 556. 
