OF TREES. 
* 5 * 
only the time of the foliation of trees, but the 
day alfo on which barley was fown, and cut % 
and were fo kind as to communicate to me their 
obfervations w . I acknowledge myfelf much 
obliged to each of thefe worthy gentlemen for 
the benevolence fhewn me on this occafion, 
and more particularly to D< Toren, who for 
the fpace of three years made his obfervations 
on a tree of the fame fpecies with care and di- 
ligence ; as alfo to D. Ec,’c Ekelund, who did 
the fame with the like induftry for, two years* 
Some perhaps had not always time, or op- 
portunity to make their experiments with the 
fame attention ^ for thofe, who are detained 
in cities, often want a number of trees to ob- 
ferve thefe things as they ought, and thofe, 
who live in the countrey, are often drawn by 
domeftic affairs from things of this nature. 
But if obfervations were made according to 
the following rules, ill, That they fhould 
be continued for three years , and thofe fpe- 
cified, as well as the places in every obferva- 
tion. 2d. That they fnould be made on the 
w The author gives in a note a lift of eighteen perfons who 
had communicated their obfervations made in Sweden, Nor- 
way, Finland, and Lapland, fome for one, fome for two, 
others for three years from 1750 to 1752 both incluiive. 
I. 4 fame 
