1835.] Improvements in Science. 219 



Cycadites praecedentes speciei ? Spad linear, elongat sub- 

 cylindric squam imbric fructum superantibus ovat subro- 

 tund obtusiusculis integer convex, inferior patulis, superior 

 adpressis, fructibus inferior, magis explicatis subrotund 

 depressis convex obtusissimis, arete imbricatis magnitud 

 lentis superior, multo minor magisque globosis. 



Plants in the coal formation of Skania. — Abies St ember gii, 

 ramulis adscendenti erectis tuberculatis : fol confert tuber- 

 culis insertis linear, acutiuscul sessil, uninervibus erecto, 

 patentibus, vel patent, semipollicaribus ramulis paullo an- 

 gustioribus. 



Lycopodites phlegmariformis caule erectiusculo, fol inte- 

 ger, acutiusculis, erectopatentibus uninervibus (per exsicca- 

 tionem) transverse lineatis semiamplexicaul, alternis, infe- 

 rior remotioribus oblong lanceolat, superior imbricat oblong 

 minoribus. 



Potamophyllites? Agarethiana, fol lingulato linear ner- 

 vosis, integerrimis. — Kongl. Vet. Acad Handl. 1831, 340. 



Article IV. 

 Analysis of Kirwanite. By Robert D. Thomson, M. D. 



This mineral, to which it is proposed to apply the name 

 Kirwanite, in honour of the late distinguished Irish chemist, 

 is found in the county of Antrim, filling amygdaloidal 

 cavities in basalt. 



The texture is fibrous ; the fibres diverge from a centre, 

 forming green brushes ; opaque ; about the hardness of sul- 

 phate of lime. Before the blowpipe per se becomes black, 

 and partially fuses. Fuses with soda, borax, or salt of phos- 

 phorus, into a dark brown glass. Sp.gr. 2-941. The com- 

 position of the mineral is 



Silica 40-50 



Protoxide of iron . 23*91 



Lime 19*78 



Alumina . . . . 11*41 

 Water 4-35 



99-95 



