116 
deep. These boxes were placed on end, one on the 
windward, the other on the leeward side of the fountain, 
and the test papers were pinned in the upper ends of the 
boxes, and the boxes so placed that the papers were not 
exposed to direct sunlight, nor to wind and rain. 
The first experiments were made on June 16, 1875, and 
three of Schonbein’s test papers were placed in each box 
and exposed from 9.30 a.m. to 1.30 p.m. At the Arnfield 
fountain the resulting tints were : — ■ 
In Windward. In Leeward. 
Box (W). Box (L). 
4-5 7-0 
5*5 7-0 
52 8-0 
Mean = 5*07 Mean = 7*33 
At the Hollingworth fountain they were 
W. L. 
5-0 6-5 
4*0 6-5 
5-0 7*5 
Mean = 4’67 Mean = 6*83 
Fresh papers were exposed from 1.30 to 6.30 p.m. with 
the following results 
ARNFIELD. 
W. L. 
5*5 8-0 
7-5 70 
6 0 5‘0 
Mean = 6 “33 
The third paper in the L. box was evidently a faulty one. 
HOLLINGWORTH. 
w. 
L. 
50 
6-5 
4-0 
65 
4-0 
6-0 
6“67 
Mean = 4“33 
Mean = 6“33 
