Mar. 1S92.] THE BOTANICAL SOCIETY OF EDINBURGH. 



303 



Although the two younger and three older Araucarias 

 agree in the great proportion of the first half-season increase, 

 which varies between 68'5 and 79 p.c, they differ materially 

 in the monthly incidence. In the younger trees the increase 

 of April is barely appreciable, but in the others it is distinct 

 enough, particularly in No. 35, its annual average amount 

 being 0*16. On the other hand, increase seems to linger 

 later in the season in the younger trees, but as from rough- 

 ness of the stem they were more difficult to measure than 

 the older trees, this may be an error of observation. June 

 was the best month in all but No. 65, in which it was 

 decidedly May. 



Larix europ^a. 



The half-season proportions were exactly equal in No, 

 20, but in No. 89 the first, with 56'5 p.c, predominated. 

 June was the best month in both, with an average annual 

 amount of 0'41 and p.c. of 33*5 in No. 20, and of 0"29 and 

 31 p.c. in No. 89. 



B. Collective Results. 



The general monthly results are considered under the 

 following heads in the Deciduous and Coniferous groups 

 respectively : — 



(1) Monthly amount of Girth-increase in the trees 



individually and collectively. 



(2) Monthly jjwijoi^tions of Girth-increase in the trees 



collectively. 



(3) Monthly jiroiwrtion of Girth-increase in the trees 



individually. 



