ON THE RAINFALL IN THE BRITISH ISLES. 433 
nexed diagram; and the accordance would doubtless have been still more 
striking had the velocity during the time of rain been recorded instead of the 
total motion in 24 hours. 
Fig. 1. . 
Ratio of 25-ft. fall to 
that at ground. 
Velocity of wind. 
Mean angle from 
Vertical. 
5. The necessity of all observers keeping the top of their gauges strictly 
level is brought out very clearly by these Tables; they show that in summer 
a tilt of even 1° will cause a difference of 0-2 per cent. in the amount col- 
lected, and in winter of 2 or 3 per cent. It is not infrequent to find gauges 
2° or 3° from level, which would give a total error of 5 per cent. if they 
were always inclined towards the wind; but as the errors are never inten- 
tional, it is probable they neutralize one another ; but it would be far better 
for observers to be careful to keep the orifices level, and so avoid the error 
altogether. 
We mentioned last year that Professor Phillips had promised to examine 
these records ; this he has not been able to complete, but he hopes to do so 
during the coming year. 
The gauges constructed for Colonel Ward of Calne, in the year 1863, for 
the purpose of determining (1) the ratio of decrease of rainfall with eleva- 
tion above the ground, and (2) the relative amount collected by gauges of 
different sizes and forms, and observed by him during the years 1863-1867 
have, in consequence of his ill health and removal from Calne, been moved 
during the past year to the Rectory grounds, Stratfield Turgis, Winchfield, 
Hants, where they have been placed under the care of the Rey. OC. H. Griffith, 
an experienced and very accurate observer. 
The Rectory is at a height of 200 feet above the mean sea-level, in lat. 51° 
20' 23” N., and long. 0° 4" 10° W.; a space of 32 acres, with no tree more 
