Now there is an error somewhere, for it is found by actual computation that the discrepancy between the solar and the Julian year is about three days in 400 years. It certainly is true that the vernal equinox fell on the 21st in 325, and was restored to that place by Gregory in 1582; since which time it has been made to fall on the 21st by the Gregorian rule of intercalation. Again it is stated by the same author that the discrepancies in time from Caesar to Gregory is thirteen days, from the Council of Nice to Gregory ten days; now 10 + 4 = 14. While our author states it is thirteen days, he also states it is fourteen days; a discrepancy of one day. The mistake evidently is in making the 25th instead of the 24th, the date of the vernal equinox in the time of Caesar, consequently a difference of four days instead of three from Caesar to the Council of Nice. I.--PAGE 59. The concurrence of the solar and the civil year was restored by Gregory in 1582, or 1600 is the same in computation; but the discrepancy between civil and solar time is 11 minutes and 10.38 seconds every year, which in 100 years will amount to 18 hours, and 37.3 minutes; reckoned in round numbers 18 hours, and is represented on the chart, hours behind time 18. The intercalary day or 24 hours being suppressed in 1700, causes the civil year to be 6 hours in advance of the solar, and is represented on the chart 6 hours in advance. Now this discrepancy of 18 hours for the next 100 years, will cause the civil year in 1800 to be 12 hours behind; again suppressing the intercalation it will be 12 hours in advance. In 1900 it will be 6 hours behind, but the correction makes 18 hours in advance. The 18 hours gained the next 100 years restores the coincidence in the year 2000 and so on, the solar and the civil year being made to coincide very nearly every 400 years. From close examination it will become evident that the solar and the civil year coincide twice every 400 years, though no account is made of it in computation. From 6 hours in advance in 1700, the civil year falls back to 12 hours behind the solar in 1800, consequently they must coincide in 1733. Again from 12 hours in advance in 1800, it falls back to 6 hours behind the solar in 1900, consequently they must coincide again in 1867. Discrepancy between Julian and solar time in--1 year is (365d. 6h.) - (365d. 5h. 48m. 49.62s.) = (11m. 10.38s.) 100 years is (11m. 10.38s.) x 100 = (18h. 37.3.) 400 " (18h. 37.3m.) x 4 = (3d. 2h. 29.2m.) 4,000 " (3d. 2h. 29.2m.) x 10 = (31d. 0h. 52m.) 100,000 " (31d. 0h. 52m.) x 25 = (773d. 21h. 40m.) Discrepancy between Gregorian and solar time in-- 1 year is .373m. 100 years is .373m. x 100 = 37.3m. 400 years 37.3m. x 4 = 2h. 29.2m. 4,000 " (2h. 29.2m.) x 10 = 1d. 0h. 52m. 100,000 " (1d. 0h. 52m.) x 25 = 25d. 21h. 40m. Discrepancy between corrected Gregorian and solar time in--