38 CHRISTISON—ADDITIONAL OBSERVATIONS ON 
the latter to millimetres, a laborious task accomplished by help of 
lowling’s invaluable Metric Tables. 
My method of measuring, and the precautions taken in selecting 
suitable trees are fully explained in the “Notes” (4), Royal 
Botanic Garden, Edinburgh, and need not be repeated here. 
DIVISION OF THE SUBJECT. 
From the beginning of the observations certain objects were 
kept specially in view, and subsequently others suggested 
themselves and were duly followed up. Thus, ultimately, a 
considerable number of lines of inquiry were established, so 
distinct from each other that they can be treated in separate and 
more or less independent chapters. In considering them, the 
most convenient plan will be to take the later results first and 
work gradually back to the earlier ones, republishing the latter 
only when necessary. Finally, the eres of ae trees indi- 
vidually throughout their whole career will be g 
The divisions of the subject will be eg in sie following 
order :— 
I. Effects of transplantation on girth-increase. 
Il. , _ pruning y rs 
III. Fluctuations in girth-increase (a) in frost, (4) in 
open weather. 
IV. Annual and monthly girth-increase. 
V. The beginning and end of girth-increase in the 
growing season. 
VI. Progress of girth-increase in the growing season. 
VII. History of the trees individually. 
As it seems undesirable to delay publishing the results until 
the whole of them have been digested, the first instalment is now 
offered, containing the first two divisions. 
PRELIMINARY REMARKS ON THE EFFECTS OF 
TRANSPLANTATION AND PRUNING. 
When the square park surrounding Inverleith House was 
joined to the Botanic Garden in 1876 to form an Arboretum, a 
considerable amount of timber, from about 50 to 100 years old, 
