472 TRANSACTIONS OF THE CANADIAN INSTITUTE. [VoL. VI. 
SUMMARY. 
1. In the living cells of Cyanophycez, with the exception of those in 
which the transverse diameter of the trichome is very minute, two zones 
can be readily made out: one central, uncoloured, the other peripheral, 
holding the pigment. The cytoplasm forming the central zone, or 
body, is denser than that present in the peripheral layer. 
2. The pigment is dissolved in a fluid which occupies vesicles in the 
cytoplasm of the peripheral layer. There is no evidence of the presence 
of a special chromatophore. 
3. The central body is finely vesiculated and, except in its periphery, 
almost free from granules. In it obtains a small quantity of a chromatin- 
like substance which resists the action of artificial gastric juice and con- 
tains organic phosphorus and “masked” iron. This substance is 
uniformly diffused throughout the cytoplasm of the central body. 
4. The cytoplasm of the peripheral layer is, compared to that of the 
central body, always somewhat coarsely vesiculated. It gives a very 
faint reaction for ‘* masked” iron and a feeble reaction for organic phos- 
phorus.. In the part immediately adjacent to the central body the 
reactions for both are slightly deeper than that demonstrated in the 
outermost part of the peripheral layer. ; 
“5. The granules present are usually of two types, one of which is 
formed of a substance staining with hematoxylin and containing 
“masked” iron and organic phosphorus and, therefore, resembling chro- 
matin. They are, on prolonged digestion with artificial gastric juice, 
dissolved. Granules of this, the first type, when large, are found to be 
hollow spherules. These granules are usually found in the peripheral 
portions of the central body, but they are not confined to that part, for 
they may rarely be observed in the central parts of the central body 
and also in the inner zone of the peripheral layer in some forms. 
6. The granules of the second type are to be found in the peripheral 
layer and chiefly adjacent to the cell membrane. Rarely are they 
hollow spherules. They are constituted of a substance which stains 
deeply with picrocarmine and is free from organic phosphorus and 
“masked” iron. This substance dissolves very quickly in weak acids. 
As it gives a reaction for sulphur when treated with plumbic acetate in 
alkaline solution, it is probably a proteid. 
7. In one form, Cyléndrospermum majus, only one kind of granules is 
