812 



" The epidermis of the interveinal spaces of the under side of the 

 leaf, consists of cells with a sinuous boundary, numerous stomata, 

 formed by two crescentic cells, applied by their extremities, being 

 scattered about. 



" Acicular raphides are of frequent occurrence ; they abound also 

 in the glandular stipules found between the petioles of the opposite 

 leaves. 



" The application of pressure causes the escape of very numerous 

 raphides, together with a peculiar, thick fluid. In soine instances 

 this substance has a vermiform appearance, when forced out of the 

 enclosing sac, owing to its having been exuded, I suppose, through a 

 small orifice." 



Mr. Oliver then gave a description of the stipulary glands, similar 

 to what has already been given by Weddell and others, in the case 

 of the CichonacesB. 



Drawings, and specimens under the microscope, were shown, in 

 illustration of Mr. Oliver's remarks. 



The following gentlemen were elected Fellows of the Society, 

 viz. : — John Stuart Blackie, Esq., Professor of Greek in the Univer- 

 sity of Edinburgh ; Alexander Cowan, jun., Esq., 30, Royal Terrace ; 

 and William John Menzies, Esq., Murrayfield House. 



The Society then adjourned till the second Thursday of January. 



Microscopical Society of London. 



June 2-3, 1852. — Geo. Jackson, Esq., in the chair. 



A paper by Professor Williamson, entitled, ' Further Contributions 

 to the Structure of Volvox globator,' was read. 



The authoi''s views with respect to the cellular nature of certain 

 appearances in Volvox globator, as detailed by him in the ' Transac- 

 tions of the Philosophical Society of Manchester,' having been con- 

 troverted by Mr. Busk, in a paper lately read to this Society, and as 

 subsequent researches have, in Mr. Williamson's opinion, confirmed 

 his former statements as to the cellular structure of that organism, he 

 considered it necessary to lay before the Society the present paper, 

 containing some account of the observations by which he considers 

 he has established the correctness of his former assertions. The 

 object of the paper was therefore to adduce proofs, not of the vege- 

 table nature of Volvox globator, for on that point both of these 



