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acters of the fruits are the same. This shows that the character 

 of the vine is determined by the character of the seed from which 

 it comes. My observation shows that this is invariably the case. 



There is no reason, therefore, to suppose that there is ever any 

 immediate effect of crossing in pumpkins and squashes.* 



2. Do pumpkins and squashes mix? — No one appears to doubt 

 the indiscriminate mixing of pumpkins and squashes. Before 

 considering the question, it is necessary to divide the fruits called 

 squashes into two groups. One group includes the summer and 

 fall squashes, like the scallops, common crooknecks, cocoa-nut, 

 Bergen, and the like ; these belong to the same species as the 

 field pumpkin, Cucurbita Pcpo. These squashes cross with the 

 ordinary field pumpkin and with each other, although the mixing 

 even here does not appear to be indiscriminate. The other group 

 includes the Hubbard, Marblehead, turbans, and the so-called 

 mammoth squashes and pumpkins like Mammoth Chili and Val- 

 paraiso ; these belong to a distinct species, Cucurbita maxima. 

 Many careful pollinations have been made between these two 

 classes of fruits, and in no case have seeds been procured. Some- 

 times the fruit will develop for a time, and in two or three in- 

 stances a summer crookneck pollinated by a turban squash has 

 developed until half grown, and has then persisted until the end 

 of the season, but it was seedless. All our experiments show 

 that Cucit7 r bita Pcpo and C. maxima do not hybridize. 



It is an easy matter to find fruits in any large assortment of 

 pumpkins or summer squashes which might be taken for hybrids 

 with the Hubbard or turbans by a casual observer. But none of 

 these fruits which have come under my observation — and I have 

 seen hundreds — possess any marks of hybridity, and they have 

 occurred in our experiments among pedigree stock which had no 

 Cucurbita maxima blood in it. These so-called hybrids are noth- 

 ing more than incidental variations of Cucurbita Pcpo, and they 

 may appear anywhere at any time. 



Our experience and observation show, therefore, that the field 

 pumpkins and the summer and fall types of bush squashes do not 



* The same observation can be made with reference to blackberries and 

 raspberries. Over 250 successful hand pollinations were made this year be- 

 tween blackberries, raspberries and dewberries in many combinations, and 

 there were no immediate effects. 



