THE CHLOROPHYLL APPARATUS 147 
As already stated, many botanists consider the protoplasm 
to be arranged in a network, whose meshes are filled with 
a solution of the pigment. Others consider the protoplasm 
to be homogeneous, but honeycombed with vacuoles which 
are filled with the solution of the chlorophyll. Others 
again think that the pigment forms a layer round the 
plastid. By the action of dilute acids, or by treating the 
chloroplasts with steam, the colouring matter may be made 
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Fic. 87.TRANSVERSE SECTION OF PORTION OF AERIAL STEM OF Equisetum. 
a, cortical lacuna; b, lacuna in vascular bundle; c, chlorophyll-containing cells. 
to exude from the framework in viscid drops, leaving the 
latter colourless. It then appears to have a reticular 
structure, but how far this condition is brought about by 
the action of the reagents is uncertain. The chlorophyll, 
however, is certainly not uniformly diffused through the 
body of the plastid. ; 
