490 PHENOLOGICAL OBSERVATIONS IN NOVA SCOTIA 
latter case, the average will be the “region” phenochrons. 
When a full sheet can be made out for each belt, the averages of 
the phenochrons for the three “ belts” will give the phenochrons 
for the “ region.” 
Blanks. 
“There is a convenience in averaging the dates of the ten 
stations, which accounts for the ten columns for stations in the 
form within. When a few dates are not given, it may be fair 
to enter in the blanks the dates from a similar neighboring 
station which is not otherwise utilized for the sheet. Great 
care should be taken that such observations taken from a 
schedule not summarized should appear to be what might have 
been observed at the station indicated in the heading; and to 
indicate such a transference the date should be surrounded by 
a circle with the pen, which will always mean that the obser- 
vation was not made in the station heading the column, but in 
a neighbouring one, and was taken from a supernumerary 
schedule.” 
Thunder-storms. 
“These dates will be entered in their respective columns and 
opposite the month indicated. They will not be averaged, of 
course.” 
Accuracy. 
“Care must be exercised in selecting schedules, the observa- 
tions of which appear to have been carefully made, neglecting 
any which give reason for doubt, when selecting for summation 
on the form within. Great care must also be exercised in 
copying the figures and entering them, so that no slip may 
occur. Every entry should be checked. One slip may spoil the 
effect of all the accurate numbers entering into the summation. 
In like manner, great care has to be taken in adding and aver- 
aging the figures; and for this purpose every sum should be 
done twice in reverse order, so as to give absolute confidence in 
the accuracy of the work.” 
