Vice-President’s Address. 237 
I cannot conclude without acknowledging my great 
indebtedness’to numerous friends who have willingly helped 
me in my studies of the flora of the Carboniferous period, 
and without whose aid my knowledge of the flora of this 
period must have been very much more imperfect than it is. 
Even with all their kind assistance, I am just beginning to 
know how much there is still to learn about our Carbonifer- 
ous plants, but I hope that my friends will continue to afford 
me what help they can, as there is much work yet to be done 
in this interesting field of paleontology. 
Note—I am frequently asked where good figures of the 
British Carboniferous flora can be found. An answer to 
this question would entail a long list of the literature of the 
subject, which is scattered through the Transactions of 
numerous scientific societies, as well as contained in many 
volumes specially devoted to this subject. 
But good figures of the more typical species will be found 
in Brongniart’s “ Histoire des végétaux fossiles” and Zeiller’s 
“Flore fossile du Bassin houiller de Valenciennes,’ the 
latter being specially excellent for Middle and Lower Coal- 
Measure Species. For the Lower Carboniferous flora, the 
most complete work is Stur’s “Culm Flora,” though it does 
not contain all the British species. Many other useful works 
might be mentioned, but references to many of these will be 
found in the works of Zeiller and Stur mentioned above. 
