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In regard to the apple there is some difference of opinion. 

 There are many who believe the action is immediate. Crozier 

 and Rolfs in experiments made a few years ago on the col- 

 lege grounds found no difference when the Oldenburg apple 

 was crossed, although the pollen was obtained from ten 

 different varietiep, using it as a female plant. The fruits 

 were all alike and resembled uncrossed specimens of the 

 Oldenburg. The Iowa State Horticultural Society has at its 

 trial stations done much crossing and hybridizins. Numerous 

 varieties were crossed on the Soulard and other forms of the 

 wild crab {Pyrus coronariu). Collman, Fluke and Watrous 

 all inform irie that they could see no immediate effect of the 

 pollen on ihe wild crab. It was in all essentials a wild crab. 

 Darwin, however, gives evidences to show that the effect 

 may be immediate in some cases. In another case a smooth 

 apple affected a rough coated kind. The remarkable St. 

 Vallery apple, in which the stamens are abortive and do not 

 produce pollen, is of interest in this connection. 

 When artificially pollinated the fruit differs in size, flavor 

 and color, but resembling in character the perfect kinds with 

 which they have been fertilized. This case may not be so 

 strong as started by Darwin. Crozier, who looked up the 

 original French reference, think there is some doubt in regard 

 to it. I have several times had my attention called to apples 

 which plainly showed two varieties; in one case an apple 

 was half Baldwin, the other half was a greening. Some 

 years ago I saw some apples, one-half of which were gros 

 pomier, the other half was unknown to me. It was thought 

 that these showed an immediate effect, but I was unable to 

 get a further history of the case. 



It is a very common belief that there is an immediate 

 effect in the cr.)ssing of cucurbits. Suuh is, however, not 



