4263. Plants having any appendage to the calyx or corolla, and eight or more stamens, are generally poisonous. As columbine, nasturtium.
4264. Plants having twelve or more stamens, and a nauseous sickly smell, are generally poisonous.
4265. To ascertain the Length of the Day and Night.—At any time of the years add twelve hours to the time of the sun's setting, and from the sum subtract the time of rising, for the length of the day. Subtract the time of setting from twelve hours, and to the remainder add the time of rising next morning, for the length of the night. These rules are equally true for apparent time.
4266. Leap Year.—Leap years are those that are exactly divisible by four, and also by 400, and not by 100. The year 1900, therefore, will not be a leap year.
4267. True Time.—Two kinds of time are used in Almanacs; clock or mean time in some, and apparent or sun time in others. Clock time is always right, while sun time varies every day. People generally suppose it is twelve o'clock when the sun is due south, or at a properly made noon-mark. But this is a mistake. The sun is seldom on the meridian at twelve o'clock; indeed this is the case only on four days of the year: namely, April 15, June 15, September 1, and December 24.