POUI^TRY NOTES. 47 



duction on a relative or percentage basis. This may be done 

 according to the following rule. The measure of an individual 

 hens egg production in any given time may be taken to he the 

 percentage zuhich the number of eggs actually laid is of the 

 maximum number of eggs which might have been laid by the 

 individual in this given length of time, assuming the production 

 of one egg a day to be the maximum of which a hen is capable. 

 According to this rule if a hen lays 20 eggs in the month of 

 June (30 days) this hen's egg production is 66 2-3 per cent for 

 that month. Or again if a hen lays 31 eggs in the months of 

 December and January (62 days) she would have a 50 per cent 

 record in tgg production for those months. Such a rule as this 

 puts all egg records on a comparative basis. It will be recog- 

 nized that this is a great advantage for the purpose of scientific 

 discussion. On any other basis no records are strictly compara- 

 ble which do not cover equal and the same periods of time. 



In order to facilitate the calculation of such relative or per- 

 centage egg records Table II has been prepared. The purpose 

 of this table is to show the number of days from (and including) 

 the first day of any given month in the year to (and excluding) 

 the first day of any other month. On the assumption that the 

 maximum possible productivity of a hen is one egg a day the 

 values in Table II give the maximum possible egg production 

 for any specified period of a year. These figures then may be 

 used in calculating the percentage egg production. 



