is equal to one fourth of a strip the same length, and 12 inches wide: Therefore 28-4-7 and 7+28-35 the superficial content of one side.

2. The stick is 1 foot and a half wide; therefore it will contain 35 solid feet, and the half of 35; consequently, 35-2-17 ft. 6 in. and 17 ft. 6 in.+35 ft.-52 ft. 6 in.

TIME.

60 seconds, marked s. make 1 minute,

60 minutes,

24 hours,

7 days,

4 weeks,

m.

13 months, 1 day, 6 hours,

1 Julian year, yr.

Explanation of the origin of the Julian

year.

The Romans called the first day of each month, calends. Julius Cæsar, a character similar to Bonaparte, regulated the calendar about fifty or sixty years before the birth of Christ. Julius found, that 365 days were about 6 hours short of the true year: he decreed that the 24th day of February, in every fourth year, should be reckoned twice. This reckoning taking place 6 days before the calends of March, and one day being reckoned twice, gave it the appellation, bissextilis, which is literally, the sixth of the calends twice. But the Gregorian calendar, instituted by Pope Gregory the XIII, in 1582, and adopted by the British government in 1752, which we now use, drops three days of the Julian calendar in 400 years, and makes the year equal to 365 days 5 hours 49 m. 12 sec.

PERIODICAL YEAR.

Astronomers say, that the true periodical year, is calculated from the time of the Earth's period about the Sun, in departing from any fixed point in the heavens, and returning to the same again;" it consists of 365 days, 6 hours, 9 minutes and 14 seconds.

TROPICAL YEAR.

The tropical year contains 365 days, 5 hours 48 minutes and 57 seconds-An explanation of its origin belongs to

astronomers.

LESSON 1.

How many days from 15th January to the 19th August inclusive? Answer, 216 days.

..40

LESSON 4.

LESSON 6.

A gentleman began boarding on the 15th of May at breakfast-he paid his bill on If a man was born on the the 19th of August after sup25th October, 1755, how old per; how many weeks did he will he be on the first of No-board, and how much was his vember 1815? Ans. 60 y. 6 d.

1815

1755

bill at 4 dollars 75 cents a week after giving him 1 day's board gratis? Ans. 13 w. 65 dollars 12 cents.

Suppose we begin to reckon the 10th of Nov. and wish to know what time in the next year 21 weeks will end; on what day and of what month will it be allowing 28 days in February? Answer 6th of April.

MODE OF OPERATION.

How many days in 21 weeks? 147. How many months? 5 and more. In what month will 5 end? April. How many days in those calendar months? If more than 147 deduct and find to what day in April the true time will

In 156700 seconds, how many hours?

Answer, 43 hours, 31 min. 40 sec.

In 43 hours 31 minutes and 40 seconds, how many se

LESSON 11.

How many days from the birth of Christ, to Christmas, 1815, allowing each year to contain 365 days and 6 hours? Answer, 662928 d. 18 h. over.

As each year contains 6 hours more than 365 days, so we must have 1815 times 6 hours, and these hours must be divided by 24 to bring them into days.

PROOF BY COMPOUND MULTIPLICATION.

Carry at 24 in the hours.

5478 18-fifteen years.

Continued.

When a cannon ball flies at the rate of 1 mile in 74 seconds, in what time will it fly 1 mile?

4)7.5 seconds allowed for 1 mile.

Ans. 9.375 sec.

1.875 the fourth of 7.5 for of a mile.

9.375 for 1 mile.

NOTE.-Twelve calendar months as they are printed in the Almanack make a year, but in the computation of time, we make use of 13 months, each containing 4 weeks, and each week 7 days; for portions of time less than a year.

LESSON 13.

George Washington, the American patriot, was born 22nd February, 1732, and died 14th of December, 1799; what was his age ?

Answer, 67 years, 10 months, 2 weeks, 1 day.

Now calculate how many months, weeks, and days, there are from the 14th of December, to the 22nd of February following, and subtract them from 68 years.