120 Annual Report of the Council. 



enriched palaeobotanical science. Among the exceptions 

 special mention should be made of the really fine " Mono- 

 graph of the Morphology and Histology of Stigmaria 

 ficoides," published by the Ray Society in 1887 ; the paper 

 "On the Relation of C alamodendron to Catamites" in the 

 Memoirs and Proceedings of this Society (Ser. IV., Vol I., 

 1887) ; and the elaborate memoir in which he endeavoured 

 to elucidate the growth and development of the arborescent 

 Lepidodendra of the Coal Measures by a study of the details 

 of their organisation (Mem. and Proc. Manch. Lit. and Phil. 

 Socy., Ser. IV., Vol. IX., 1894-5). Of the Royal Society's 

 memoirs "On the Organisation of the Fossil Plants of 

 the Coal Measures," Williamson published, independently, 

 19 in all, the first appearing in the Transactions for 1871, 

 and the last in the volume for 1893. On his removal to 

 London in 1892 he associated himself with Dr. D. H. 

 Scott, F.R.S., of the Jodrell Laboratory, Royal Gardens, 

 Kew, and a second series of memoirs, containing the 

 results of their united investigations, was commenced 

 under the title of " Further Observations on the Organi- 

 sation of the Fossil Plants of the Coal Measures." The 

 subjects of all these memoirs are too numerous to be 

 enumerated here, and it is the less necessary to do so 

 since the contents of the independent ones are given in 

 detail in the third part of the "Index" to the same, 

 which Williamson published in our Memoirs and Pro- 

 ceedings for 1893-4. Let it suffice to say that there 

 is scarcely a type of carboniferous plants that is not 

 dealt with at greater or less length, and always with 

 the result of adding something to our previous 

 knowledge. The forms included under the well-known 

 names of Catamites, Lepidodendron, Sigillaria, Stigmaria, 

 and Sphenophyllum are prominent, as are several types 

 of Ferns, under the provisional name of Rachiopteris, 

 and a few Gymnosperms. But in addition to these we 



