Nov. 1899.] BOTANICAL SOCIETY OF EDINBUEGH 



249 



Dividing the year into growing and sleeping halves, these 

 trees show the following percentages of growth : — 



Growing Season. 

 1st Period. 2nd Period. 

 Paraiso . 9U 972 



Acer . . 87" 94-1 



Cottonwood 8U 93-6 



Sleeping Season. 

 1st Period, 2nd Period. 



5^ 2-8 



13 5-9 



15A 6-4 



266 



284 -9 



;U 



15-1 



In these three trees, the second period shows a much 

 more marked contrast between growing and sleeping seasons 

 than in the other seven deciduous trees, notably so in the 

 case of the old Paraiso — 97*2 per cent, in six months, against 

 8 3 '4 per cent, of the young Paraisos. Also, in this second 

 period, the rate of growth of these three trees is less than half 

 what it was in the first period during the sleeping season. 



Table IV. collects the monthly averages of growth of the 

 six evergreens in Table I., the seven deciduous in Table 

 II., and the three deciduous in Table III., and gives their 

 percentages of increase for five, nine, and fourteen years. 



Table IV. — Totals of Monthly Growths of Trees in Tables I., II.. and 

 III. for Nine Years ; and Percentages of Growth for Five, Nine, 

 and Fourteen Years. 



This Table IV. shows that in the nine-year period the 

 chief growth in the evergreen group is in March, September 

 coming next ; and their least growth in June, December 



s 



TRANS. BOT. SOC. EDIN. VOL. XXI. 



