The same principles are followed by horticulturists; but the variations are here often more abrupt.
No one supposes that our choicest productions have been produced by a single variation from the aboriginal stock.
We have proofs that this is not so in several cases in which exact records have been kept; thus, to give a very trifling instance, the steadily increasing size of the common gooseberry may be quoted.
We see an astonishing improvement in many florists' flowers, when the flowers of the present day are compared with drawings made only twenty or thirty years ago.

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