48 TRANSACTIONS AND PEOCEEDINGS OF THE [Sess. lv. 



enunciated, and he hoped Mr Mann would l^e able yet to 

 discover a differential stain for the endo-nucleolus in addition 

 to that for the nucleolus he had announced to the Society. 



Commentaries on British Plants. No. I. — The 

 Coarse Anatomy of the Wood of the Stems of British 

 Plants. By Prof. Bayley Balfour and Dr Muirhead 

 Macfaelane. 



The authors stated that they had been for long engaged 

 in preparing an account of the morphology of British plants, 

 and that their attention having more recently been directed 

 to the structure of woods, they now exhibited to the Society 

 hy means of the lantern, the structure of the wood of plants 

 sindigenous to or naturalised in Britain. Projections of the 

 wood of the following plants were then exhibited on the 

 screen : — Junijjei'us communis, Finns sylvcstris, Taxtis haccata, 

 Clematis Vitalba, Berbcris vulgaris, Cheiranthus Chciri, Hdian- 

 themwn mdgare, Tamarix gallica, Hypericum Anclroscemum, 

 Hyijericum calycinum, Lavatera arhorea, Tilia europoea. Ilex 

 Aquifolium,E^Lonymuseuro]jmus,Rhammiscatharticus,Bhamnus 

 Frangula, Acer campestre, Acer Fseudoplatanus. 



A continuation of this exhibition was postponed to a sub- 

 sequent meeting of the Society. 



On Temperature and Vegetation at the PiOyal Botanic 

 Garden, Edinburgh, during the Month of December 1890. 

 By Robert Lindsay, Curator of the Garden. 



The month of December was, on the whole, a favourable 

 one. A good deal of frost occurred during the month, but 

 not so severe as to do much injury to vegetation. Com- 

 paratively tender plants are, so far, uninjured in the open 

 ground. No snow fell, and tliere was a very light rainfall. 

 The thermometer was at or below the freezing point on 

 twenty occasions, the aggregate amount of frost registered 

 being 121°, as against 70° for the corresponding month of 

 1889. The lowest readings occurred on the 10th, 20° ; 19th, 

 22°; 20th, 22°; 21st, 20°; 22nd, 17°. The lowest day 

 temperature was oO\ on the 13th ; and the highest, 56°, on 



