228 JOURNAL OP THE TRINIDAD 



Lcetuce Sativa (Lettuce). 



Lactuca Virosa. 



L Altissima. 



Lactucin B. (C22. H18. 07). Kromayer. 

 Lactucopicrin B. (C. 44, H. 32, O. 21). Kromayer. 

 Lactucon. (CI 6. H. 260.). Fliickiger. 

 Gallactucon. Franchemont. 



from L. Altissima. 

 Lactucerin. Hesse. 



Mikanea Guaco. (Leaves). 

 Guacin B. Faure. 



Leontodon Taraxacum. (Dandy lion.) (Juice.) 

 Taraxacin B. Kromayer. 



Vernonia Kigritana. (Batjentjor). 



Vernonin (4. Heckel k Schlagdenhauffen. (a cardiac 

 poison). 



Xanthnim Strumaria (seeds). 



Xanthostrumarin (4. A. Zander. (Poisonous). 



THE MEANS OF FREEING CATTLE OF TICKS. 



IN previous papers on this subject, sufficient stress has been laid 

 on the importance of keeping the cattle in as healthy a con- 

 dition as possible. Whether or not the ticks select the poor 

 cattle for attack, the fact remains that well-fed sleek animals 

 are not usually much troubled by these parasites. 



The same applies to the necessity of keeping the pastures in 

 as good order as possible. It is not easy in tropical countries to 

 ensure the growth of the right kinds of grasses and shrubs; but 

 this is certainly no reason why the task should be altogether 

 avoided. A little care would at any rate materially improve 

 the character of the herbage. The fencing off of portions to be 

 eaten down in rotation is not an expensive matter, and this is 

 the most important item in the improvement of pastures. 



Such measures as burning, draining and liming should be 

 adopted where necessary, but while the latter is a much valued 

 application for all grass lands, the former will not often be of 

 use in these islands. For the rest, there seems no need of insist- 

 ing that clean pastures will prod uce clean animals. 



The most direct and primitive method of the removal of 

 ticks is that of simple extraction, 



