CHAPTER IV. 



CHROMATOPHORES (PIGMENT BODIES) COLOURED CELL-SAP 

 LEUCOPLASTS. 



PRINCIPAL MATERIALS USED. 



A large-leaved Moss, such as Funaria hygroinetrica or Mnium Iwmum. 

 The former grows very commonly on ground which has been charred, 

 on limestone walls, etc. ; the latter on pots and walls of fern-houses t 

 Or the prothallium of any fern. Fresh. 



The same preserved in alcohol. 



Flowers of Tropceolum, just opened. Or fruits of Hawthorn, Rose, Aspara- 

 gus, or Tomato. 



Flowers of Strelitzia regina ; Verbascum nigrum ; Antirrhinum majus. 



Flowers of Vinca major or minor; petals of Rose; sepals of Larkspur; 

 flowers of Adonis. All fresh. 



A Carrot. 



Leaves of Copper-beech ; autumn leaves of Virginian creeper ; of Maiden- 

 hair tree ; of Oak. All fresh. 



Pseudo-bulbs of Pliajus grandifolius. Fresh, or fixed in picric acid and pre- 

 served in alcohol. Rhizomes of Iris germanica : stems of Pellioni 

 Daveauana ; fresh. 



PRINCIPAL REAGENTS USED. 



Potash Dilute chloral hydrate Methyl violet, gentian violet, or rosani- 

 line violet O2 per cent, acid fuchsin. Fixing reagents : saturated 

 solution of picric acid in water ; saturated solution of picric acid and 

 corrosive sublimate in alcohol. 



Structure of Chlorophyll Grains. We have already had an 

 opportunity in several objects of obtaining an insight into the 

 nature and appearance of the Chlorophyll grains or bodies; 

 but we will now give some special attention to these structures. 

 We select for this purpose a very widely distributed moss, which 

 is distinguished by very fine, large, lenticular chlorophyll bodies, 

 and of which the leaves, unilamellar with the exception of the 

 mid-rib, permit observation without further preparation. Such 



(51) 



