214 



Table 15. The numher of amoebocytes, containing food-vacuoles, 

 present in the (ravel) preparation (p. 7t^ — 15) of green and colour- 

 less Spongülidae (hefore, and after they Jiave heen cultivated in 

 aquaria) froni light and- from darkness, in tissues in different stages 

 of developynent (conf. Tahle 6). 



Immediat.ely after the capture of green Spongillae from light and 

 colourless ones from darkness their brancli-tops and branch-bases 

 were examined as for their amount of amoebocytes containing food- 

 vacuoles; of Ephydatiae only the fuU-grown tissue was studied (conf. 

 Table 6). After some weeks' culture in water from the conduit in 

 light or in darkness this examination was repeated, tlien, only for 

 fuU-grown tissue. Generally of each sponge a piece was cultivated in 

 light and another one under equal circumstances in darkness. As 

 for the meaning of I — XII , see p. 14. The total number of amoe- 

 bocytes present in the preparation was always very nurnerous (XI). 



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

 of the examination. c. The then stated number of amoebocytes con- 

 taining vacuoles present in the preparation of a branch-top (t.) or a 

 branch-base (b.), for cultures in light or in darkness; viz. on the 1^' 

 line the number immediately after the capture (so at the beginning 

 of the experiment) and on the 2'"! the number at the end. Finally 

 for each tissue group the data, concerning all analyzed sponges together, 

 are composed. 



All observations are mentioned, The green Ephydatiae came from 

 tlie light, the colourless ones from darkness or from the liglit. As for 

 the discussion, see pag. 94. 



