Moore : The study of winter buds 



129 



Cornus mas and Forsythia viridissima bloom in early January, as 

 they often do, it {?, possible that the temperature of the fall and 

 winter months has a higher significance for these species than for 

 cherry." 



Kiister (1899) holds that those organs in which growth is 

 demonstrable during an unusually mild winter cannot fail to show 

 some advance in a normally cold one. 



Buds which were measured during each month of the winter 

 1905-6, show no appreciable increase in length or in diameter, 

 although the winter was one of unusual mildness, a winter in 

 which the mean temperature, 2*^^ F. for the coldest month, was 



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Figure D, Quercus alba. Curves of growth of the buds in length and diameter. 



exceedingly high. The buds of the following species appeared 

 absolutely dormant : Fagus americana, Fagiis sylvatica, Quercus 

 alba, Quercus nibra, Tilia vulgaris, Tilia ainericana, Hicoria errata, 

 Hicoria ^mcrocarpa, and Fraxinus aviericana. The flower buds 

 of Alniis inca?ia, Uluius americana, Bctula populifolia, Populus 

 treniidoides, Salix fragilis, and Salix alba are more or less easily 

 influenced by continuous high temperatures and consequently 



