NATURE OF EXCRETORY PROCESSES IN MARINE POLYZOA. 1538 
Subsequent observation showed that the animals were not 
really dead. At 48 hours from the beginning of the experi- 
ment, the pigment taken up by the funicular tissue was com- 
mencing to be deposited in intensely brown (almost black) 
spheroidal masses of granules in various parts of the funicular 
tissue. This process continued as time went on, and fig. 18 
represents the appearance of the tissue at the 143rd hour. It 
will be observed that the leucocytes have by this time taken 
up the pigment, but that in three of those which are drawn 
the pigment is not contained in all the vacuoles of the cell; so 
that the cell consists partly of coloured and partly of un- 
coloured vacuoles. The Bismarck-brown taken up by the funi- 
cular tissue is obviously, for the most part, segregated into 
dense deposits of granules, while the remainder of the tissue 
has become absolutely hyaline and colourless, containing, 
however, occasional granules of Bismarck-brown. The parts 
of the tissue which are now hyaline are, in their normal con- 
dition, filled with coloured granules, the absence of which 
clearly shows that the granules, all of which originally took 
up the Bismarck-brown, have accumulated in the dense brown 
masses seen at the nodal points, and have thus succeeded in 
ridding most of the tissue of the obnoxious foreign substance. 
_ At the same period some of the zoccia contained minute 
polypide-buds. 
At a later period (238th hour) the leucocytes were still 
bright yellow, most of them having deposited a few granules 
of Bismarck-brown in their vacuoles. The funicular tissue 
retained its previous appearance, the deposited pigment usually 
tending to accumulate round the “ brown bodies,” in the form 
of a dense brown mass at the back of the zocwcium. The 
tissues which were in course of regeneration, i.e. the polypide- 
buds, the new muscles, and the greater part of the funicular 
tissue, were quite transparent and colourless. 
At the 312th hour the leucocytes were still more brightly 
coloured, and contained deposited granules of Bismarck-brown, 
indicating a continued effort on their part to remove the dele- 
terious pigment from other tissues. The funicular tissue had 
