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mode of nourishment when the Algte witlihold tlieir functions in 
tlie absence of light. It perishes if it does not then adapt itself to 
the mode of alimentation which properly belongs to it." 
“ The animal renounces its independent life, and allows itself to 
be supported entirely by its parasites, when once the green or 
yellow Alga3 have entered its tissues and have multiplied there 
sufhcicntly. It absorbs no more organic substances, although it 
is perfectly able to do so ; but is entirely comparable, from the 
morphological point of view, to an animal devoid of chlorophyll. 
I\rori)hologically, it is the Algm which are the parasites; but 
physiologically, the animal.” 
Iluis far Herr Brandt ; but Mr. Geddcs was simultaneously and 
independently studying the “yellow cells" of Radiolarians and 
Coelenterates, of which in Eadiolarians, Professor Huxley in his 
Manual writes thus : “ In the layer of protoplasm from which 
the pseudopodia proceed, celljeform bodies of a bright yellow 
colour, which have been found to contain starch, are usually 
developed;” and ho found that these cells survive the Kadio- 
larian in which they are contained, that their mode of division 
is thoroughly algoid, that starch is invariably present, that the cell 
wall is true plant cellulose, and the yellow colouring matter is 
identical with that of diatoms. Thus the chemical composition, 
as well as the structure and the mode of division, are those of 
unicellular xllgre ; and Mr. Geddes proposes for them the generic 
name of Phihzoon, dividing the genus into slightly differing 
species, according to the hosts in which they are found. 
As to the physiological relationship of the plants and animals 
thus so curiously associated, “ every one knows that the colourless 
cells of a plant share the starch formed by the green cells, and it 
seems impossible to doubt that the Eadiolarian, which actually 
encloses the vegetable cell, must similarly profit by its labours.” 
In fact, there is a reciprocal process of nutrition going on ; for 
whilst tlie animal profits by the starch formed by the plants' the 
latter, in their turn, profit by the carbonic acid and nitrogenous 
waste made by the animal ; and, removing these, “ perform an 
intracellular renal function, reaping an abundant reward, as their 
