P| ag REPORT—1857. 4. 
At y, out of the 13 maxima and minima, on the second day after the day 
of change, the proportion of the former to the latter was as 2:], No maxima 
or minima, however, were found to occur for 22 years on any of the three 
days following on ) in the months of April, May, June, July, September, or 
October; whilst on the 4th day after ) (or the Znd octant), seven out of the 
eight maxima and minima occurred in these very months. 
At © there is the following alternation, — 
«. 
+12 —12 +14 —20—15. 
— 6+ 7—11+ 6+ 5. 
5. By the courtesy of Mr. Glaisher Iam able to give additional evidence 
of system of considerable value from his tables of mean temperatures of 
each day at Greenwich for 43 years. 
It will be interesting to compare the maxima and minima mean tem- 
peratures, which I have extracted for the earlier half of this period (from 
1814 to 1835), with the Dublin results (from 1830 to 1852). Thus the 
number of maxima and minima of the month which occurred at Dublin 
on the three days preceding @ were, +13—10; +5—6; +5—8. At 
Greenwich +11—6; +3—6; +8—7. On the three days before p, at 
Dublin, +6—5; +6—8: +7—8. At Greenwich, +8—7; +9—11; +8 
—9. On the first and second days after ), at Dublin, +12—9; +9—4. 
At Greenwich, +8—6; +15—6. On the three days before Q, at Dublin, 
+8—7; +6—9; +15—12. AtGreenwich, +15—10; +10—8; +5—6. 
On the second day before and after (, at Dublin, +13—5; +4—16. At 
Greenwich, +10—9; +8—20. The due proportion of maxima and minima 
would have been +9—9 for each of the above days. This, in the following 
Table of maxima and minima in the month for the days of the change, will 
be found to be very nearly the case at @ and p. 
Tas_e IV. 
sun) >, p48) cereale | 
: $ +13. 
At Dublin, 1830-1852. ......21{ 179) 18 {+16} 264 Die 244 ah: | 
-+10,| 5 
At Greenwich, 1814-1836,... 204 19! 184 *. 23 {+15 23 {+e 
It will be noticed also, that with the single exception of the day of O, the 
regularity in the proportion of maxima to minima which runs through these 
figures is far greater than could a@ priori have been thought possible. 
6. Though time has not permitted me to enter on an examination of the 
remaining mean temperatures at Greenwich, I am able to give the highest 
and lowest maxima and minima in the month for the whole series of 43 years 
from the notes at the foot of Mr. Glaisher’s Tables; the days of the moon’s 
age being obtained from the Nautical Almanack. ‘The following was found 
to be the grouping of the highest and lowest temperatures at the period 
of ), to which attention was originally drawn :— 
That is to say, on nearly 16,000 observations, eleven out of the twenty-four 
highest and lowest mean temperatures occurred at the above period, and 
