MR. J. G. BAKER ON DRACiENA AND CORDYLTNE. 
27 
degree at any part of their scales. These instruments have been 
approved by the Eoyal Horticultural Society. 
A B 
A, Ground Thermometer— the stem of the instrument should be provided 
-with a circular plate to rest on the soil as stated in the text ; b, Wet and 
Dry Bulb Thermometer. 
YII. On Dracaena and Cordyline. By J. G. Eakee, F.L.S., 
Assistant Curator of the Xew Herbarium. 
[Eead June 26, 1872.] 
Theee are two genera of arborescent Liliacese which since the 
beginning of the century have been distinguished by botanists by 
universal consent, and which are well-marked from one another 
both by structural differences and by habit, which seem lately, so 
far as nomenclature goes, to have drifted into a state of fusion in 
our collections and trade catalogues in a way that certainly would 
