Early Growth of Trees. 165 



while those of opposite habit are said to be inde- 

 terminate. It is, of course, apparent that plants of 

 indeterminate growth are not hardy, as a rule. A 

 series of careful measurements of growth was made 

 upon various trees and shrubs at Lansing, Michigan, 

 in 1886, and some of the records are presented be- 

 low.* The last date in each case designates the ter- 

 mination of growth for the year. It will be 

 observed that very few of the plants grew until 

 July. This fact is illustration and proof that in 

 our rigorous climate cultivation should stop early, 

 and that it should be vigorous at the opening of 

 the season. 



RECORDS OF GROWTH.! 



Acer dasycarpum May 12th, 1 in.; 16th, 2 in.; 25th, 4 in.;. 

 June 6th, 7 in.; 13th, 9 in.; 20th, 10 in.; 29th, 12 in. 



*Accr Pennsylvanicum May 12th, 2 in.; 18th, 4 in.; 20th, 

 5 in.; 26th, 7 in. 



Acer platanoidesM.&y 12th, 3 in. ; 16th, 4 in. ; 20th, 5 in. 



Acer Pseudo-PlatanusMay 14th, 6 in.; 18th, 8 in.; 16th, 12 

 in. ; 30th, 13 in. ; June 6th, 20 in. ; 13th, 23 in. ; 20th, 24 in. 



Acer rubrumMay 26th, 5 in.; 30th, 6 in.; June 6th, 9 in.; 

 13th, 10 in. 



* Bailey, Bull. 31, Mich. Agr. College, 73. 



t In making the measurements recorded above, one average shoot was 

 selected on each plant, and measured from time to time during the growing 

 season. The drought may have checked growth to some degree, although it did 

 not become severe until the end of June. Most of the plants stood upon the 

 eampus, with no cultivation. A few were younger, and stood in the rows of a 

 closely planted arboretum, where they received occasional cultivation, or 

 in a newly-pl anted group, where the soil was frequently hoed; these plants 

 are designated by asterisks. 



