168 



KANSAS ACADEMY OF SCIENCE. 



2. 8. 4, etc., denote the hours of the day. begiuniiig at 1 a. m. The points (jf the curve 

 are at the half -hours: thus the tirst point marked by figures is at half an hour after 

 midnight, or at 12:30 a. m.: the next at one hour afterward. 



The lowest velocity occurs at about half-past five in the morning, and is 6.67 

 miles per hour at this time. There is a gradual increase until half-past one in the 

 afternoon, when the maximum — 12.39 miles per hour — is reached. From this time 

 until half past .seven in the evening a gradual decrease occurs, from which time until 

 about half -past seven in the morning the wind is almost constant. The average 

 hourly velocity at different stations is as follows. The rates for all places excepting 

 Manhattan and Lawrence. Kansas, are taken from Loomis's Meteorology. 



Manhattan 9.35 New Orleans 8.00 I London, Eng lo.oo 



Lawrence 15.30 San Francisco 9.00 Madras, India 7.00 



New York 11.00 Liverpool, Eng 13.00 Cape of Good Hope 17.00 



Chicago 8.00 I 



The highest velocity that has been recorded was at 6:30 p.m., April 8. 1890. and 

 was sixty miles per hour. It blew at this rate for about ten minutes. The highest 

 record for a whole hour is fifty miles, on the same evening. 



The lower curve shows the mean daily velocity for the different months. Begin- 

 ning with February, 1889. the velocity is shown for each consecutive month up to 

 November, 1890. The figures do not show the exact velocities, but are the nearest 

 whole number. The total number of miles of wind that passed during any month 

 may be found by multiplying the mean daily velocity of that month by the number 

 of days in the month. The lowest velocity was in October, 1889, being 157 miles: 

 the highest in June, 1890, being 322 miles. The highest daily velocity that has been 

 recorded for a single day was 710 miles, on April 11, 1890. The average daily veloc- 

 ity is 223.49 miles, which gives an average hourly velocity of 9.31 miles. This very 

 nearly agrees with the average of the upper curve, the discrepancy being accounted 

 for by the fact that the lower record covers a longer time than the other. 



The accompanying diagram presents in condensed form the results of some 

 thousands of calculations. 



11 1-2 1 -2 :i 4 5 6 7 8 » 10 11 1_» 

 J, J., AT MANHATTAN. 



IL'.U 



;{ 4 5 6 7 8 9 10 

 WIND VKI.OCITY 



MEAN DAII.Y CURVE 



EVOLUTION IN LEAVES. 



BY MKS. W. A. KELLERMAN. MANHATTAN. 



Even the most casual observer could not fail t(j notice the general variation in 

 the foliage of plants; that the various herbs, shrubs and trees bear leaves stamped 

 with an individuality of tlieir own. Anyone would In- able to distinguish l)e1ween 



