108 WILLIAMSON : MEMOIRS AND PAPERS. 
On the organization of Volkniania Dawsoni. Mem. of the Lit. and 
Phil. Soc. of Man., ser. 3, vol. v., p. 27, seq. 1871. 
On the structure of Dictyoxylons of the Coal Measures. Brit. Assoc. 
Rep., vol. xli., 1871. 
On the classification of the Vascular Cryptogamia, as affected by 
recent discoveries amongst the Fossil Plants of the Coal 
Measures. Brit. Assoc. Rep., vol xli., 1871. 
On the organization of an undescribed Verticilate Strobilus from 
the Lower Coal Measures of Lancashire. Man. Lit. and Phil. 
Soc. Proc, vol. X., 1871. 
Exogenous structures amongst the Stems of the Coal Measures. 
Nature, vol. iv., 1871. 
Notices of further researclies on the Fossil Plants of the Coal Mea- 
sures. Ann. Mag. Nat. Hist., vol. ix., 1872. 
On Fern Stems and Petioles of the Coal Measures. Brit. Assoc. 
Report, vol. xliii., 1873. 
On Coal and Coal Plants. Macmillan, vol. xxix., 1873. 
Earthquakes and Volcanoes. Lecture given at Hulme Town Hall, 
Manchester, December, 1874. John Hey wood, Deansgate, 
Manchester. 
Primeval Vegetation in its relation to the Doctrine of Natural 
Selection and Evolution. Essays and Addresses, Owen's College, 
Manchester, Macmillan and Co., 1874. 
The Dawn of Animal Life : Lecture given in the City Hall, Glasgow, 
Nov., 1875. Collins, Sons and Co. 
On the structure of Stigmaria. Man. Lit. and Phil. Soc, vol. 
xiv., 1875, and Nature, 1875. 
On some Fossil Seeds from the Lower Carboniferous Beds of Lan- 
cashire. Brit. Assoc. Rep., 1875, 
Corrections of the Nomenclature of objects figured in a Memoir on 
some of the minute objects found in the mud of the Levant 
(1872). Man. Lit. and Phil. Soc, vol. v., 1875. 
The Succession of Life on the Earth. Manchester Science Lectures 
for the People. Macmillan, 1876. 
Recent researches into the organisation of some of the plants of the 
Coal Measures. Brit. Assoc Rep, 1876. 
