78 SPECIAL TOPICS IN THEORETICAL ARITHMETIC of America, Joseph U. Barnes, President), Sol (International Fixed Calendar League, Moses B. Cotsworth, Secretary). The extra month according to the proposal would be placed between June and July. The extra day of a leap year would be allowd for by Arthur by making the New Year’s inter- regnum two days long, by others by placing it after the 28th of June (or February, where it is now), without any week day name, calling it Leap Year Day, and not assigning it to any month, or else calling it the 29th of June (or February). Arthur and the Fixed Calendar League would place the 1st " of the month, and hence the 15th, on Sunday (incidentally making 13 Friday the 13th’s in every year)! Business men would probably prefer the plan of the Liberty Calendar Asso- ciation, which places the 1st and the 15th on Monday. According to this plan the calendar for every month would be as follows: Fixed Calendar (sometimes called Perpetual!) Mon Tues Wed Thurs Fri Sat Sun 1 2 3 4 5 6 1 8 10 11 12 13 14 17 18 19 21 24 25 26 28 Those who wish to consider Sunday the first day of the week can still have Monday for the first day of the month by thinking of the calendar in the following form: Fixed Calendar Tues Wed Thurs 2 4 9 11 16 18 25