Mar. 1892.] THE BOTANICAL SOCIETY OF EDINBURGH, 327 



the three of Cn.prcssus 4, G, and 7'5 ; and of Sequoia, 7'5, 9, 

 and 16"5. 



Se2)tember. The most reliable species with a comparatively 

 high proportion are P. cxcdsa, with 5, 9*5, and 13'5 p.c; the 

 two young Ah. Loioiana, with 13"5 and 14 ; and above all 

 the single but most reliable Ab. grandis, with 20 p.c. Nine 

 of the thirty-four reached 8 p.c. or upwards in this last montli 

 of the growing season. 



d. Distribution of Girth-increase over the Growing Season in the 

 Younger Group of Coniferae. 



There is apparently less tendency in the Conifeijie than in 

 the Deciduous trees to confinement of the main girth-increase 

 within narrow limits of time. Three of the latter grew 

 above half their amount in a single month, but the only 

 Coniferous trees which approached at all nearly to this were 

 Araucaria, 44*5, Ah. Hookeriana, 42'5, and Cupressus, 40"5 

 p.c. Again nine of the thirty-four Deciduous trees, but only 

 three of the twenty-one Coniferne increased 70 p.c. and 

 upwards within two months, the three highest examples of 

 the former yielding 80, 79'5, and 79^5 p.c. ; and of the latter, 

 75, 70"5, and 70"5. But it is in a three-month period that 

 the contrast is most striking. Twenty-four of the thirty- 

 four Deciduous trees grew 80 p.c. or upwards within three 

 months, and of these four grew 90 p.c. and upwards. But 

 of the twenty-one Coniferae, only six entered the first of these 

 categories, and none reached the second, and one of the six, 

 a Larch, is not evergreen. Among the twenty-four Decidu- 

 ous trees which grew 80 p.c. or more in three months arc 

 included both specimens of Fraxiiius, Tilia, Frunvs, Carpinus, 

 Pyru^, Fagus, JEseidus, and Popidus fastigiata, and three of 

 the four of Acer and Quercus. Both examples of Araucaria 

 and both of Cupressus occur in the five evergreens of the 

 same category. 



The most striking examples among the Evergreens of 

 growth extending well over the whole season are — 



