95 
January. In October, however, it was nearly as great as 
in June, both at 10.30 a.m. and 6< p.m. 
The difference between the mean maximum temperature 
in the sun and the mean maximum in the shade was greatest 
in December, and least in June. The values for May, No- 
vember, and September differed, however, but little from 
that in December, while the value for January was only one 
degree above that for June. The low value for January is 
remarkable as the dryness of the air was above the average, 
the rainfall at a minimum, and the mean amount of clouds 
much below the average. 
The mean minimum temperature on the grass was lowest 
in January, the month of least amount of cloud at 6 p.m., 
and highest in J une, the month of the greatest amount of 
cloud at the same hour. The lowest minimum on the grass 
was 83*0 degrees in January, and the highest 57'0 degrees 
in June. 
The greatest monthly rainfall was 26*98 inches in June, 
and the least 0*40 inches in January. The six consecutive 
months of greatest fall were May to October, when the total 
amount was more than three times that of the remaining 
six months. 
The greatest mean amount of ozone was 7*4 in February, 
and the least 4*9 in September, the difference being thus 
only 2-5. Ozone was present on every day of observation, 
and the lowest daily amount recorded was 2*0 in the month 
of September. In February, April, and June the daily 
amount never fell below 5*0. On the other hand the daily 
amount never exceeded 9*0 in any month. 
In every month the mean amount of cloud at 10.80 a.m. 
