Geological Surveys of Kentucky and Arkansas. 249 
that when the mother cotyledons are exhausted, the young plants 
shall attack the stores of food in the soil with that vigor which 
is needful in order to appropriate them without hindrance. 
The fact that winter wheat is more delicate and fastidious in 
its infancy than most other crops, is perhaps the main reason 
why it does not succeed well on many good lands, and why it 
cannot be continuously produced from the same soil, year after 
ear. It is a matter of experience that wheat requires a rather 
firm seed-bed: beans, oats and mangold-wurzel approach wheat 
in their requirements, while barley, peas and turnips are best 
suited in a light tilth. On the other hand, climate, weather and 
tillage so influence the character of the soil, that even on light 
lands, wheat may find all the conditions of its growth. The bed 
which is produced by inverting a clover sod, and allowing it to 
consolidate by time and rains, or by passing a heavy roller over 
It, is eminently adapted to wheat, even on a rather light soil, 
; he fact that in the cases given above from Stoeckhardt, clover 
succeeded when sown with lucerne or esparsette, would indicate 
i possibly, the condition of the seed-bed was the cause of 
ilure, 
tec 
€ven in the highly concentrated mother liquors which remain 
after As, eae ag the crystallizable salts, yet the fuci find and 
accumulate it, and we must grant 
€m, in sufficient quantity 
nee 
* 
ingredients of plants on the development of oats and barley, 
found that he could not by any ibility exclude chlorine from 
- this element in them, and yet he invariably discovered it in the 
1861, 
