Conifers 
The rate of increase shows considerable variation 
(see below). 
INCREASE IN GIRTH IN INCHES PER ANNUM. 
Mauldslie| Renfrew | ayrshire, | Dumbarton- 
Silver fir 
Yew 4 
Pinus silvestris Peni pine) . 
Cedar of Lebanon 5 
Sequoia gigantea (1891- ~1903) . 
. . 
55-75 “51 
sae 8 .69-1.22| .50-.80 
was .67 to I one 85-1.25 
baie .28 to .34 aa au 
3.50 Ma oa fee 
In Germany there have been many careful researches 
as to the growth of trees, as is shown by the following 
table ;* °— 
. Heights in Metres at the 
Age in Ages of Tallest 
ek Trees | Age.| Diameter. 
rowth is known. 
most rapid. to Years. | 50 Years. |z00 Years. 
Pinus silvestris | 6-25 3.7 | 7.9-19.8 | 13.5-29| 48 m. | 600] 1 metre 
years | (2.3'-12') | (23'-65’) |(44’-94') (156 ft.)} years | (39.37 in.) 
Pinus nigra var.|... I. 1o-1r | 17-18 | 35 m. | 600 Pe 
austriaca (5’) (32'-35’) |(56’-59')(114 ft.) years 
Pinus pinaster . ‘ses 3-4 m. 8-10 m. ale 25m. | 400] 0.75 m. 
(9’-12’) | (26’~-32") (81 ft.) | years | (29.67 in.) 
Pinus cembra .| 150-250] .o1-.028 L7 3.7 for 600 
years |(3.9’-10.9")| (5.6’) (12’) years ss 
Pinus strobus . | 20 years — 19-24.6| 33.2 | 76m.| 460] 1.60 m. 
10'-16' | (62’-80’)|} (108’) |(247 ft.)| years i 993 in.) 
Cupressus sem- ae abe ie aa 52 m. | 3000 
pervirens 
(169 ft.)| years a 98 i in. ) 
* Kirchner Léw and Schroter, 4c. ‘The work by Elwes and Henry, which 
gives many details for English trees, is unfortunately not accessible to the 
author. For thé rates given for silver firs, Scots firs, &c., the author must 
express his hearty thanks to Mr. Renwick for notes and reprints,!° 
1 Schimper. 
* Dengler. 
? Masters. 
10 Renwick. 
2 Mey. § Rikli. 
5 Sargent. 8 Cieslar. 
8 Haberlandt. ® Kirchner, Low, and Schroter. 
249 
