COUNCIL FOR 1891 , 
15 
reduced by the substitution of six shutters at Naburn Lock; 
three of lOj X 4 feet on the east side and three of 11 i X 4 
feet on the west, instead of the old sluices. These only 
measured 4X4 feet for the three on the east and 4J X 4 feet 
for the three on the west. Besides the great increase of area 
(264 square feet instead of 51 square feet), the facility of 
working the shutters has led to their much more frequent use. 
The east shutters were put in in 1881 and those on the west 
side in 1883. 
Summer level was recorded on 4 days in June but not 
besides ; but the water was off from May 28th to June 6th. 
Auroras were numerous although on no occasion very 
brilliant. The dates were :—March 2nd, 5th, 9th, 13th, 29th, 
30th, 31st; April 7th, 28th; May 19th, 31st; September 26th ; 
October 26th, 27th ; November 2nd, 20th, 21st; December 6th. 
Sunset glows, as during last year, were frequently fine. 
Our table now contains greater detail as to humidity, which 
is such an important element of climate. 
We are again indebted to Henry Richardson, Esq., and 
Richard Thompson, Esq., for additional tables of Rainfall and 
bright Sunshine. 
Owing to unavoidable causes the gauge at Oswaldkirk could 
not be attended to regularly, but the total is probably correct. 
Sunshine is as usual greatly in excess there from November to 
February, the station being above the valley fogs. The 
deficiency in July and August is remarkable and so is the great 
excess in May. 
Library. —The Honorary Curator has to report a continued 
accession of books, obtained for the most part by donation or 
exchange. 
During the past year the work of cataloguing has progressed 
steadily, and the Honorary Curator intends to carry it on 
during the coming year. 
The Reed Reference Library continues to increase, Mr. Reed 
having added a large number of Works duiing the past year. 
Botany. —Mr. H. J. Wilkinson, who has kindly devoted 
much time during the past year to examining our Herbarium, 
