209 



tion and grnwth were excluded as mucli as possible in these expe- 

 rinients. At the same time also cultures of green chlorophyll cor- 

 pust'les isolated from tlie same or from other sponges (p, 9) were 

 made iu water from the lake or (and) in that from tiie conduit. in 

 light (ir iu dai'kness. Also these cidUires were placed (in l)ottles) in 

 the aquaria; consequently, all experiments of one series were exposed 

 to the same temperature. If the cultures (in bottles) arose from the 

 same sponge, which was also used for the sponge-experiment, they 

 have no special n" in the table; but they have, when arising from 

 another sponge (except in n" 41ü — 436). P'or each sponge piece and 

 for each culture the intensity of multiplication, the concentratiou and 

 the total increase or decrease in number of the green corpuscles 

 was examined after some weeks. 



In the table is indicated: a. The n" of the experiment, h. The 

 cbncentration of the green coipuscles in the sponge tissue at the 

 beginning of the experiment; that in the cultures in water was then 

 always weak (w. or w. +}, only in n" 3ü9 — 316 and n" 379 it was 

 moderate (m.), while that in the water-cultures of n" 410 — 436 is given 

 in the table. c. The date the experiment was brouglit to an end. 

 d. The results then stated : sub 1 the number of the stages of divi- 

 sion per 100 green chlorophyll corpuscles; sub 2 the concentration of 

 these corpuscles in the part wliich had been examined; sub 3 the 

 total increase (-[-) or decrease ( — ) or the equalness (0) of the whole 

 mass (here = the whole number')) of these corpuscles, calculated (per 

 unit of volume) from the colour-clianging ^) ; all this, concerning the 

 corpuscles present in the sponges or in the water from the lake or 

 in that from the conduit, in light as well as in darkness. e. Whether 

 the sponge material had been taken from a Spongilla (sp.) or from 

 an Ephydatia (e.). /'. Some remarks. 



As for the method of examining and comparing the concentration 

 of the chlorophyll corpuscles in the sponge tissue and in cultures, 

 see p. 81. We shall call this concentration in a green to dark green 

 sponge or membrane : strong (s.); that in a yellow-green to light- 

 green (gray-green) sponge or membrane: moderate (m.); that in a 

 colourless to greenish to light yellow-green sponge or membrane: 

 weak (w.) *). 



All experiments are mentioned; those belonging to one series are 

 placed together in one space. 



As for the discussion, see p. 54 — 56 and p. 77 — 83. 



1) A3 Ihcir size in sponge tissue and water remains almost equal. 



2) In the table -}- or — to an indication (eg. ni. + , Q- +-) mcans, Ihat the 

 quantity is somowhat greater or somewhat smaller, ihan the indication denotes by itself. 



14 



