550 Report oF THE HorrTIcuLTURIST 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 estivalis species comes next, see its 
hybrids, Ulster, Mills, etc.; afterwards the labrusca species comes 
into bloom, see Concord, Isabella, ete. 
begins when the temperature rises to 15 deg. to 17 deg. C. (59 deg. to 62.6 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. 
