OBSERVATORY AND THE PUBLIC SCHOOL, FORT- WILLIAM. 539 



Introduction, p. 7). That at the Schoolhouse is an ordinary gauge of 5 inches diameter, 

 with rim 1 foot above ground. It will be seen from the table that, as a rule, the 

 Schoolhouse rainfall is the greater, the total excess being 6*751 inches in the seventeen 

 months.. During this time the total fall registered at the Observatory was 11 7*106 

 inches, thus giving an excess to the Schoolhouse of 5*8 per cent. But a comparison of 

 the Beckley gauge with another standing beside it of similar pattern to that used at 

 the Schoolhouse, showed that the latter registered 1*2 per cent, less than the Beckley. 

 Therefore the true excess of the Schoolhouse for similar gauges is only 4*6 per cent. This 

 seems to be due to the situation of the gauges. One of the Observatory gauges was 

 placed for over three months at the back of the house, near the steep bank described 

 above; it there showed an increase of 3*3 per cent, over a similar gauge beside the 

 Beckley at the front of the Observatory, or fully two-thirds of the excess at the 

 Schoolhouse. The bank not being so steep behind the Observatory as at the School- 

 house, it seems probable that the 4*6 per cent, of excess at the latter place is wholly 

 due to the more confined situation and to this abrupt rise of the ground close to, and 

 for most of the rain-bringing winds to leeward of, the gauge. 



Summary. 



Excess of Schoolhouse gauge over Beckley gauge at Observatory, . . . .5*8 per cent. 



Part excess due to difference of pattern of gauges, . . . . . . 1*2 ,, 



True excess of Schoolhouse over Observatory, ....... 4 - 6 „ 



Excess at back of Observatory over front of ditto, . . . . . . . 3'3 „ 



Amount of Cloud. — The proportion of sky covered with cloud on the to 10 

 scale was estimated at both places at 9, 14 and 21 o'clock, and the differences of the 

 monthly averages are given in the table. On the mean the Schoolhouse estimates are 

 0*4, or 4 per cent, below those of the Observatory. 



