* 



256 MR. S. LE M. MOOBE'S STUDIES 



(c). Methyl- green. Rose: xylem and hard bast green like 

 nuclei ; other tissues bluer. 



Isoetes. Meristem walls green, in beautiful contrast with the 

 blue walls not giving proteid reactions. 



Fig. Xylem green, elsewhere blue, seen best in hard bast ; 

 latex blue or green. 



Arunclo. Walls giving proteid reactions green ; rest blue. 



Maize. Ditto. 



(d). Corallin-Soda. Eose : xylem and hard bast deep piuk ; 

 other walls brown-pink. 



Isoetes. Meristem walls pink. 



Fig. Xylem pink ; other walls unstained, or but very faintly. 



Arunclo. Walls giving proteid reactions deep pink ; other 

 walls browner pink. 



Maize. As Arundo, but the " other walls " are pink-brown or 

 uncoloured. 



(e). Picric Sands's blue. Eose : cuticle, hard bast, xylem 

 yellow ; other walls blue. 



Isoetes. Meristem walls yellow, best seen if sections be not 

 too thin. 



Fig. Xylem yellow, hard bast a beautiful sky-blue; other 

 walls very pale blue, best seen in the colleuchyma ; latex yellow, 

 blue, or green. 



Arundo. Walls giving proteid reactions yellow ; others blue. 



Maize. Ditto. 



(f). Borax Carmine. Eose : colour not taken up at all except 

 by the collenchyma walls, which stain a very faint pioky-bluish 

 colour which soon washes out. 



Isoetes. No colour taken up. 



Fig. Ditto, and no colour taken up in many of the latex- 

 canals, though frequently the latex is brilliantly stained. 



Arundo. As Isoetes. 



Maize. Ditto. 



Some Identities hetween Heactions of Cell-walls and of Tannin 



Idioblasts, and some general considerations. 



The main object of this memoir being to prove that it is the 

 tannin in cell-walls which gives them the property of reacting 

 like proteids, the reader's attention is requested to the already- 

 mentioned identity between the reactions of tannin in a plant 



