550 ReTORT OF THE HORTICULTURIST OF THE 



It is important to note that the vulpina species (riparia Mx.) 

 is the first to come into blossom, see Clinton and the hybrids, 

 Canada, Clevener, etc.; the aestivalis species comes next, see its 

 hybrids, Ulster, Mills, etc.; afterwards the labrasca species comes 

 into bloom, see Concord, Isabella, etc. 



begins when the temperature rises to 15 deg. to 17 deg. C. (59 deg. to 62. G deg. 

 Fahr.), and at 25 deg. C. (77 deg. Fahr.), it progresses very rapidly. As the 

 temperature falls again, anthesis is retarded till at 15 deg. C. it ceases. See 

 Essai sur L' Hybridation de la Vigne, 15, 16. Paris: 1891. 



