520 NEW JERSEY AGEICULTUEAL COLLEGE 



from plant d and fertilized with pollen from another flower of the 



a 



same plant, while y signifies that the pollen for a flower upon the 

 lower or stake plant was obtained from the head plant in the row. 



When each A^ariety receives a number as it enters the breeding 

 grounds, it is not difficult to keep a record of its combinations by the 

 fractional method. For example, the "Currant" tomato, a separate 

 species, the Solarium pimpineUifoIium Dunal, when its seed was sown 

 in the greenhouse, took the lowest unoccupied number for tomatoes, 

 namely, 177, and this it must keep until the end. The books show 

 this number in combination with several others, and the following are 



selected at random : j^ This is the first generation — that is, the first 

 set of plants from the cross — and the record shows that this combi- 

 nation with the little "Currant" tomato, with its slender vines and 

 round, red fruits, when pollinated upon the "Golden Queen" (144), 

 a large yellow-fruited variety, gives, to quote from the record book: 

 "Enormous vines, with long clusters of cherrj^-red fruits." The "Cur- 

 rant" has great prepotency and dominates over the cultural varieties 



177 



of the more common garden species. Again, 128 is the second gener- 



IT 

 ation (indicated by Eoman numeral below) of "Currant" upon "Sut- 

 ton's Best of All," a fine, large, red-fruited, standard sort. This 

 continues to give very large, long vines, abounding in long clusters of 

 red fruits, averaging below an inch in diameter. In this way a "red 

 plum" has been brought into existence, and it is to be predicted that 

 the third and later generations will continue the same general char- 

 acter of long vines and clusters and small, round fruits, useful for 

 pickling. Further, the book records a cross between two crosses, as 



177 



shown by the following double fraction 122. Here the "Stone" (122), 



IE 

 103 



"Magnus" (75) and "Ponderosa" (103), are all combined with the 

 "Currant" (177). The record shows that these "'vines" were the 

 largest upon the breeding grounds, with'plants very uniform, bearing 

 long, unbranched clusters of red f niits averaging one inch in diameter. 

 It is to be remembered that the "Ponderosa" is one of the very large- 

 fruited sorts, while "Stone" and "Magnus" are both of good, medium 



