298 THE NURSERY- BO OK. 



probable. Many spores should be sown to increase the chances 

 of success, and care should be' taken that the different kinds 

 germinate simultaneously. Some species germinate quicker 

 than others, and the operator must determine by previous trial 

 what these differences are. (For methods of sowing spores, 

 see page 24.) Only a small part of the plants will be likely to 

 be crosses. In one of Lowe's experiments, only five plants out 

 of 1,000 were undoubted crosses 



Fig. ic6. Pollinating Kit, open. 



