INCREMENT OF TREES. 
DIAMETER-INCREMENT 
Aesculus - - 
Carpirtus etal - - 
Castanea vesca - ~ - 
Cedrus - ‘ “ 
Fagus sylvatica - - 
” ” = 
Fraxinus excelsior - 
Liriodendron - - 
Quercus Cerris - . 
Takis Lars - - 
Tim = - - - 
Ulmus - “ ° - 
Increment in 
I es 
197 
i 
AND NUMBER OF YEAR-RINGS 
BORED. 
nch No. of Rings. 
: 9°44 40 
- 2°0I 20 
: 7°58 28 
- 8°82 23 
: 391 4 
: aes 14 
= 3°39 12 
rs a 17 ee 
- 2°05 12 
. 454 12 
é 3°62 28 
- 1°74 20 
- 7°06 15 
1. 
COMPARISON OF Dr. CHRISTISON’S RESULTS OBTAINED BY 
MEANS OF TAPE WITH THOSE OBTAINED BY MEANS OF 
PRESSLER’S BORER.’ 
AESCULUS. 
Tape. Borer. 
“35 . . : oF 
+s . z i -38 
‘10 - - - "a5 
‘00 < = - “12 
25 3 : p 09 
‘IO - - - "18 
25 2 : 09 
26 z é E 18 
30 - - - ‘16 
‘oO * = - "12 
1°65 1°90 
1'90 
1°65 
Circum. Diff. = - 2h 
Diam. Diff.2 = - 08 
Mean Annual Diff.= ‘008 
CARPINUS. 
Spa inf. = - 
m. Diff = 
vie Annual Dift= = 
1 Measurements in both cases are in inches. 
® The Circumference-Difference 
been divided in each case by 3. This gives 
the Diameter-Difference roughly, but near enough for the present pu 
