57 



Mr, L. A, Boodle studied examples of concresceut leaves in 

 Pimts, and other abnormal specimens, and examined the anatomy 

 of several plants including West Indian Boxwood : see above. 



Mr, M, Drummond was engaged in a j-esearch on the structure 

 ■tind function of the hydathodes of various species of plants. 



Mr. E. W, Fenton made some observations on a species of 

 P eridermitnn. 



Miss E. M. Jesson examined the structure of the hairs on the 

 leaves of certain species of Rhododendron, and studied the spikelet 

 of a new genus of Grasses. 



Miss I. Massee completed a research on the occurrence of the 

 mycelium of a Macrosporiuvi in Tomato seeds, and studied the 

 life-histories of several Fungi causing diseases of plants: see 

 above. 



Br. H. Schmidt carried out some experiments on the behaviour 

 of aqueous solutions under conditions of capillary conduction. 



Prof. G. K, Sutherland investigated the life-history of a Fungus 

 parasitic on cabbage, and made a study of some new marine Fungi, 

 and of certain features in the anatomy of Spartina Toivn'sendi. 



Mr. W. C. Worsdell studied numerous teratological specimens 

 in relation to their morphological nature, and continued his inves- 

 tigations on the vascular anatomy of the Dicotyledons : see above. 



Pathology. — The amount of material submitted to Kew for 

 investigation increases in quantity year by year. This is the 

 outcome of a clearer grasp by cultivators at large of the true 

 causes of disease, which in past times were attributed to an 

 angered Deity, or to the influence of ^blight.* The dry season 

 specially favoured the development and rapid* spread of mildew. 

 Peronospora grisea, DeBary, a mildew common on many of our wild 

 speedwells and allied plants, has succeeded in establishing itself 

 on our exotic species of Veronicay' V. Hulheana being especially 

 susceptible- Cereal-blight, caused by Sphaerella Tulasnei^ Jans., 

 has been very much in evidence, the ears becoming blackened by 

 its conidial form known as Cladosporinm herhariim^ Pers. The 

 wheat crop has suffered most. There is evidence to show that 

 various diseases due to fungi and mites respectively are being 

 imported along with bulbs, and tlie sterilisation of consignments 

 of bulbs, even when apparently sound, is advisable. As usual, 

 various consignments of diseased plants from British Possessions 

 have been dealt with. 



Additions to the Herbarium during 1914. — During the year 



about 25,500 specimens' were received as donations or exchanges, 

 and 13,500 acquired hj purchase, while 4,400 were received on 

 loan in addition to those temporarily deposited for the preparation 

 of the ^ Flora of Madrns/ The principal collections are 

 enuTOcrnted below: — 



Europe. — Presented: Iceland, by Mr. W. B, Turrill; Orkneys, 

 bv Col. H. Halcro Johnston; Ireland, by Mr. R. Lloyd Praogor; 



