NATURAL HISTORY. 
1^3 
species in the beginning of the month. 
Passijlora Kennesina and other species may be propagated by 
cuttings about the end of the month. 
Pelargoniums now struck in a hotbed frame, and potted off' as 
soon as rooted will flower in November. 
Ranunculuses planted in the beginning will flower in July. 
Schizanthus retusus, and other half hardy species and varieties 
should be potted this month if they require it. 
Cinerarias of different species may be sown as soon as the seeds 
are ripe, in pots of light rich earth. 
Rose Trees may now be budded, but the buds must have a small 
portion of wood adhering to them. 
Lobellia fulgens may now be shifted into good sized pots, in which 
it will flower. 
Erico. —Cuttings may now be planted in sand, under a bell-glass, 
and place the pots on a shelf in the greenhouse, and shade them from 
the Sun. 
NATURAL HISTORY. 
ARTICLE XVIII.—GEOLOGICAL POSITIONS. 
(Continued from pay e 163. J 
Second Line of Argument. —A river consists of fresh waters of a 
district, seeking their level in the waters of the ocean. 
2nd.—Rivers usually flow in valleys to which their size and force 
bear no sort of proportion, and which, must, therefore, have been 
formed by an agency distinct from that of the waters now following 
through them. 
3rd_These valleys must have been scooped out by a force, similar 
to that of which we have distinct proof in the valleys of the chalk 
districts, which have never been occupied by rivers. We are also 
certain of this having been an aqueous agent, from the well known 
fact of their always ending on the exact level of the ocean. 
4th.—All valleys occupied by rivers terminate at length in this 
general level, in the same manner as the chalk valleys, without rivers, 
once did, though these latter are now often cut short by sea cliffs. 
5. The bed of every river is a plane, more or less inclined, accord¬ 
ing to circumstances. 
