39 
ums.—During the year the Staff has been fully occupied 
in “aga em with a large number of products received for deter- 
mination, and report and in furnishing information to commercial 
firms planters and others upon various plants of economic interest. 
The remainder of the timbers received in the rough from the 
Empire Timber Exhibition have been prepared for exhibit and 
placed in position and a large and miscellaneous collection of 
products obtained from the Rubber and other Tropical Products 
Exhibition have likewise been dealt with. Duplicates have been 
distributed to the Agent-General for Queensland, the National 
Museum Cardiff, School of Forestry at Yale University etc. 
As in past years a collection chiefly of duplicate material was 
prepared for the Bath and West and Southern Counties Show 
at Bristol also for the Shropshire and West Midland Agricultural 
Society at Shrewsbury and for the Royal Agricultural Society 
of England at Derby. The checking and relabelling of the 
contents of Museum No. J. has been completed and other 
necessary work on the permanent collections taken in hand. 
Individual students and parties from schools have made good 
use of the Museums during the year. 
B fil Bia «iat 
in Jodrell Laboratory in 1921.—Mr. W. N. C. 
Belgrave studied the laticiferous tissue of certain rubber-plants, 
and investigated one or two cases of incipient “‘ brown-bast ” 
disease. 
Mr. L. A. Boodle examined the structure of specimens from 
Lime-trees showing swellings due to Mistletoe, and compared. 
the anatomy of camphor-yielding and oil-producing examples. 
of Cinnamomum Camphora. 
Dr. J. W. Munro and Mr. R. N. Chrystal carried out experi- 
ments on the fumigation of plants with hydrocyanic acid gas- 
with a view to controlling insect pests. 
B. Turrill made determinations of the chloride content. 
of a ieee: of samples of Thames water and of the water-supply 
of Kew Gardens, in connection with injuries to plants by salt. 
Prof. F. E. Weiss made some further observations on graft- 
hybrids. 
Presentations to the Library during 1921.—A presentation of 
great value and interest has been made to the library by Sir 
William T. Thiselton-Dyer. It consists of a collection of 
201 original letters written to him by Sir J. D. Hooker, the 
first in April, 1870, and the last in December, 1909, thus covering 
a period of forty years. They will be prized because, as Sir 
William has remarked in a letter accompanying his gift, of the 
intimate picture they give of Sir Joseph himself; “his straight 
and unflinching fervour in the interests of science, and his extreme 
modesty.” Sir Joseph’s last letter in this collection is perhaps 
