PRESIDENTIAL ADDKKSS SECTION 1!. 59 



stroom, Waterber^ Distrkt. in about the same length of time 

 and the same cause." Turnino; now to stock diseases produced 

 by plants, I beheve that the cumulative vegetable poison theory 

 of lamziekte is still in favour, althouoh very little experimental 

 evidence has so far been adduced. Bait there are two cases 

 where the connection between poistmous ])lants and stock 

 diseases has been definitely established. ]\lolteno cattle disease 

 has been proved to be due to two alkaloids occurring in Soiecio 

 lafifoliiis. and stifif sickness is produced by Crofalaria burkeanu. 

 1 have no doubt that there may be a hitherto unsusjjected con- 

 nection between other stock diseases and plants. Feeding- tests 

 may establish such a connection, but even then the cure would 

 be a purely empirical one unless the principle were isolated and 

 examined. From that point <^f view the problem of plant inves- 

 tigation becomes a useful, I might almost say necessary, adjunct 

 to the valuable work carried • mt l)y the Department of Veterinary 

 Research. Time and again this ciuestion of plant inves- 

 tigation has been raised, but the appeal has always fallen on deaf 

 ears. This time, in view of the action contemplated, and the 

 steps already taken by the Government in the question of re- 

 search, the prospects are far more encouraging. But let us see 

 to it that the matter is not again allowed to sink into oblivion. 



Appendix T. 



Publicafiojis dealing 7^'ifli Smith African Poisonous and Medicinal 



Plants. 



1. Beifrage ::itr Kenntniss dcr clicniischcn Bcstandtheilc der 

 Frilchtc Ton Hyaenanche globosa Lamb., Rnphorbiaccae, 

 J. B. Henkel. Inaugural Dissertation: Jena. ( 1H57). 



.1. Flora- Capensis Medics Pvodronuts. Pappe. .^rd ed. ( l86S^. 



3. The Chemistry of South . Ifrican Plants and Plant Products. 



R. Marloth, Presid. Address to Ca])e Chemical Society 



Ci9i3)- 



4. . / Contribution to Soutli African Materia Medica. A. Smith, 



^rd ed. ( 1895 ). 



5. Das Kapland. R. Marloth. lena 1 npS). 



6. South .Ifrican P(^is<>niiiis Plants. J.. 11. Walsh. Ca]ietown 



(1909V 



7. Die Harrjniiintel 7'oii Sarcocaulon. Schulz, Inaugural Dis- 



sertation: Potsdam (]C)o6). 



8. Ac.RICrLTUKAL JotRN AL ol- THE CaPE OF ( iooD HOPE 



Kaffir Beers, their initure and composition, ('. F. 



Juritz, (1906) [Jan.l. 

 The Chemistry of S'>me Cegetable Products of South 



Africa, R. Marloth. ( 1909") [June]. 



9. AORICL'LTI-R.VL JOfKNAL ol-" THE UnION OF SOUTM AfRICA 



Preliminary Report on B^itanical Investigations into 

 Gal-Lam.ciekte. J. Burtt-Davy. 4 ("i. 2, 3. 5I. 



