210 QUARTERLY CHRONICLE. 
by dialysis as a blue fluid, whilst the chlorophyll remains in 
the cells. 
(3) The most characteristic properties of the aqueous solu- 
tions of phycocyan are, lst (spectrum), their lively fluores- 
cence in carmine is destroyed by heat and by very many 
reagents; 2nd, their separation into water and colouring- 
matter in the capillary spaces of filtering-paper; 3rd, their 
dimness and colourlessness on being boiled; furthermore, 
phycocyan is precipitated from its solution as a blue jelly on 
the addition of alcohol, acids, and metallic salts, and as a 
colourless one by potash and ammonia. 
(4) The purple-red or violet phycochromacee contain phy- 
cochrome, which is composed of chlorophyll and a purple, 
but generally (not apparently different) blue modification of 
phycocyan, which easily turns into a verdigris-coloured sub- 
stance. 
(5) The red-brown colouring-matter of the Floridese— 
namely, the rhodophyll of Cohn—is also a compound body, 
consisting of Cohn’s chlorophyll and phycoerythrin, neither 
of which are analogous to Kiitzing’s phykoerythrin (which 
is rhodophyll), or to Niageli’s phycoerythrin (which is a 
purple modification of phycochrome). 
(6) Further, rhodophyll, which is undivided in the living 
Florideze-cells, becomes split up into its two component parts 
after death by the endosmotical passage of water; in which 
case the green chlorophyll remains in the cells, whilst the 
red phy coerythrin is taken away by dialysis in a watery 
solution. This exhibits a lively fluorescence in the yellow 
part of the spectrum (Rosanoff), or the green part (Rytiphleea, © 
Cramer), and is acted upon by boiling, alcohol, acids and 
bases in the same manner as phycocyan. It has not yet been 
determined exactly how the purple modification of phycocyan 
and phycoerythrin differ. 
(7) The near relationship of phycocyan and phycoerythrin, 
on the one side, and that of the two bodies which are formed 
of these and chlorophyll (namely, phycochrome and rhodo- 
phyll), on the other, is confirmed by the fact that phyco- 
chrome is present in the Floridez, whilst rhodophyll is present 
in their nearest allies, namely, Bangia, Chantrausia, Batra- 
chospermum, and Lemania, which, although belonging to the 
Floridee, include verdigris-coloured species as well as red, 
and thus point to a nearer relationship between Phycochro- 
mace and Floridee. ‘This is strengthened by a fact in the 
history of their development, namely, the want of vibrating 
cilia, and the consequent self-movement of their reproductive 
cells. 
