THE GIRTH-INCREASE OF TREES. 183 
B. Aggregate Annual Results. 
I shall now give in a series of Tables some of the General 
Results of the Annual Observations on the Conifere. 
a. COMPARISON OF THE BEST SINGLE TREES OF 10 SPECIES IN 
Two PERIODS OF FIVE YEARS EACH, 1887-91 AND 
1892-96. 
& 
I, TREES IN WHICH THE GIRTH-INCREASE DIMINISHED IN THE SECOND 
PERIOD 
x Average Annual Increase. Girth, 
=| Species, 
e 1887-91. |. 1891-96. 1896. 
8 | AbiesLowiana - - - - 1-78 1-48 20-80 
66 5; Douglasi.- = <2 = 2 = 1:18 11d 17°05 
24 so. SLOOKGrIADR =~ 5. Hoon “59 52 15-00 
1 Sequoia gigantea Sys ee 116 "87 41°80 
2 Cedrus Deodara- - = -— - 1:07 “82 35°05 
39 jy BRCM Se : 1-26 Tl 53°05 
49 | Taxusbaccata - - - - “46 “43 32°00 
7:50 6°34 
It is shown in this Table that there was a marked falling offin 
Sequota, Cedrus Deodara, and Abies Lowdana, at girths of 42, 35, 
and 21 inches, a less marked decline in Cedrus africana and Abies 
flookertana at girths of 53 and 15 inches, while Adzes Douglastt 
and Zarus showed a very slight loss at girths of 17 and 32 in. 
