CXLIV ROYAL SOCIETY OF CANADA 



of the ten regions will be averaged to find the provincial pheno- 

 chron for each phenomenon on the list. This will be done by the 

 compiler-in-chief. 



There is a convenience in averaging the dates of 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 and neighbouring station which is not other- 

 wise utilized for the sheet. Great care should be taken that such 

 observations taken from a schedule not summarized, should 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 would always mean that the observation 



• 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. 

 The number of observation schedules represented in any " region " 

 or general sheet under this head should be noted somewhere on the 

 top margin of the page. 



Accuracy. 



Care must be exercised in selecting schedules, the observations 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 averaging the figures, and for this purpose every 

 sum should be done twice (once in reverse order), so as to give absolute 

 confidence in the accuracy of the work. 



Remarks. 



The compiler filling one of these blanks should keep one copy for 

 himself while sending the other to the compiler-in-chief. 



The set of stations on the right, under " when becoming com- 

 mon," must be exactly the same as on the left, under " when first 

 seen." The compiler can enter explanatory remarks in the blank 

 below, and should sign each sheet as a guarantee of its correctness. 

 These sheets will be bound into a volume for each year. 



