EUPHORBIA VI ROSA AND ALOE DICHOTOMA 
63 
16. That the coagulation of caoutchouc on the surface of a wound in a 
laticiferous plant must be of some importance in wound-healing is evident 1 . 
A comparison of the immediate effects of wounding in the Euphorbia and the 
Aloe emphasises this importance. The rapid recovery in the internal tem- 
perature in the former and the very slow recovery in the latter are probably 
due, in the main or entirely, to the fact that the wound is sealed by coagulated 
latex in the one and not in the other. 
I desire to acknowledge the courtesy of His Excellency the Governor and 
the Officers of the Government of German South-West Africa in facilitating 
the journey and the work of the Expedition in every possible way. The 
Expedition also received invaluable assistance from Mr E. H. W. Muller, 
H.B.M. Consul at Luderitzbucht and from Mr A. T. Scotland, General 
Manager of the South African Territories Company. I am further indebted 
to Dr F. F. Blackman, F.R.S., for kindly allowing me to consult him with 
regard to the difficulties experienced in carrying out the preliminary observa- 
tions in the Orange River Expedition of 1910-11 and for his advice on 
points arising in the present investigation ; and to Miss H. J. Davison, B.A., 
who has drawn the charts. 
1 Pfeffer, l.c. i. 582. 
Botanical Laboratory, 
South African College, 
Cape Town. 
BIBLIOGRAPHY 
Clements, F. E. Research Methods in Ecology. 1905. 
Jost, L. Lectures on Plant Physiology. (Eng. Trans.) 1907. 
Pfeffer, W. The Physiology of Plants. (Eng. Trans.) 1900-3. 
Warming, E. Oecology of Plants. (Eng. Trans.) 1909. 
Worsdell, W. C. On some points in the Stem-Anatomy of Euphorbia mi osa and Aloe 
dichotoma. Ann. Bol. Herb. I (1914), p. 6i. 
