Men who could think and calculate saw how inconvenient this would be, and what mistakes it would lead to.  If the difference did not come to much in their lifetime, they could see that it would come to a serious error for other people some day.  So Julius Caesar thought he would pull the Clock and the Sun together by adding one day every four years to the Clock’s year to make up for the odd hours the Sun had been spinning out during the three years before.  The odd day was added to the month of February, and that year (in which there are three hundred and sixty-six days) is called Leap Year.

You remember the old saw—­

“Thirty days hath September, April, June, and November; February hath twenty-eight alone, All the rest have thirty-one; Except in Leap Year, at which time February’s days are twenty-nine.”

This is called the Old Style of reckoning.

Now I dare say you think the matter was quite settled; but it was not, unfortunately—­the odd day every four years was just a tiny little bit too much, and now the Clock was spending more time over her years than the Sun.  After more than sixteen hundred years the small mistake was becoming serious, and Pope Gregory XIII decided that we must not have so many leap years.  For the future, in every four hundred years, three of the Clock’s extra days must be given up, and ten days were to be left out of count at once to make up for the mistakes of years past.

This change is what is called the New Style of Reckoning.  Pope Gregory began it in the year 1582, but we did not adopt it in England till 1752, and as we had then nearly two hundred years more of the little mistake to correct, we had to leave eleven days out of count.  In Russia, where our new Princess comes from, they have not got it yet.  The New Style was begun in England on September the 2nd.  The next day, instead of being called September the 3rd, was called September the 14th.  Since then we have gone on quite steadily, and played no more tricks with either the Sun’s year or the Clock’s year.

I wonder what happened in the year 1752 to all the children whose birthdays came between September the 2nd and September the 14th!  I hope their birthday presents did not drop through because his Majesty George the Second had let eleven birthdays slip out of that year’s calendar, to get the Clock and the Sun to work comfortably together.

Now I think you will be able to see that in the next year after this change, May-day was kept eleven days earlier in the Sun’s year than the year before; and it has been at an earlier season ever since, and therefore in colder weather.  May-day in the Old Style would have come this year about the middle of the month; and as years rolled on it would have been kept later and later in the summer, and thus in warmer and warmer weather, because of that little mistake of Julius Caesar.  At last, instead of complaining that the May is not out by May-day, people would have had to complain that it was over.