NEW VARIETIES. 73 



3. Let the varieties you employ be adapted to the 

 climate. 



4. Let the planting be so adjusted, as to time, that 

 the tassels and silk fibres of all shall appear simulta- 

 neously. If these be not in unity of time, the hybrid 

 effect will not be produced. 



5. Every sample used to propagate from should 

 be the purest of its sort, and if possible free from ad- 

 mixture. The more fixed and perfect the type of the 

 several progenitors, the more certain and acccurately 

 defined will be the qualities that mark the off- 

 spring. 



6. All corn planted for propagating purposes 

 should have every opportunity of perfect development, 

 by being placed in the best soil, at wide intervals, 

 liberally manured, and well cultivated. It should also, 

 of course, be entirely beyond the reach of the pollen 

 of any other corn. 



7. The surest mode of reaching the highest results 

 in hybridizing, though it would require more time, 

 would be as follows : 



After carefully discriminating the several sorts to 

 be used, let the cultivator improve each of these sep- 

 arately through a series of selections, as already ex- 

 plained, and then, by crossing, let him propagate the 

 intended sort from the more perfect types thus ob- 

 tained. The new variety resulting from this mode of 

 proceeding would afterwards be kept pure and still fur- 

 ther improved by continuing the same process of se- 

 lection. 



It would not perhaps be easy to foretell the extra- 

 ct 



