416 REPORT—1883. 
tionally, so as to embrace the proper time-interval, in which case the recorded 
result, 16:4, would be changed into 20-4. 
Let us next compare the mean heating effect of the sun for the half-year pre- 
eats the summer solstice with that for the half-year preceding the winter 
solstice. 
Taste If.—Comparine THE Sun's HEATING PowER FOR THE Two HAtves 
OF THE YEAR. 
cn Half-year Ending Half-year Ending 
Summer Solstice Winter Solstice 
it Fue 24-4 
| II. 33-4 we 
IV. (corrected) 20-4 — 
V. — 27:3 
VI. 19°8 = 
VII. as 25°9 
VIII. 22°3 — 
| IX. = 18-4 
| X. 20°8 — 
} XI. — 131 
EN Ge 13°5 — 
XIII. — 35-4 
XIV. 24:2 -— 
XY. — 28°5 
Sumofseven . 154-4 173-0 
It will be seen from this that, as in the former series, there is more heat of sun- 
shine during the half-year after than during the half-year before the summer 
solstice. This difference is not, however, so marked as in the previous series, where 
the numbers were 184:17 and 353:68. Whether the change of locality will account 
for this, the immediate vicinity of a large city exaggerating the difference, or 
whether the observations are not sufficiently numerous to eliminate peculiarities of 
seasons, we cannot tell. 
As in the previous series it will be necessary to form our observations into 
yearly values ; this is done in the following table :— 
Taste II].— YEARLY VALUES OF THE HEAT oF SUNSHINE AT KEw. 
Mean Date Amount Mean Date Amount 
December 1875 , 5 57°8 June 1879 A & 40°7 
June 1876 ty 4 : — December 1879  . : 39°2 
December 1876 . 3 -- June 1880 ; : : 33°9 
June 1877 , ‘ : 47-7 December 1880 A - 26°6 
December 1877 ‘ A 47-1 June 1881 5 : A 48-9 
June 1878 5 ‘. 4 457 December 1881 : s 59°6 
December 1878 ‘ ; 48:2 June 1882 : : ‘ 52°7 
With reference to this table we may permit ourselves to remark that we may 
regard the numbers for 1877-1880 as belonging to a period of few sun-spots, while 
the last three observations may be regarded as belonging to a period of an 
increasing amount of spots. On the whole the results are in accordance with 
those of the previous series, in which large numbers were found to be associated 
with times of maximum sun-spots and small numbers with times of minimum. 
It will be found that the mean of the yearly values of the above table is 45°67, 
In order to make allowance for difference of wax six of the former bowls were 
treated with the new wax, and the following results were obtained :— 
