64 



From 71 (=92 — 21) sponges in light behaved like 

 type I+IIi 63 = + 89% 



« n 1 = + 1% 



„ II"i + III 7 = ± 10% 



Consequently, in the greater majority of Spongillae, when culti- 

 vated in light, the increase of the green algae proves to surpass 

 the decrease. Accordingly, we saw that in light : a. most colour- 

 less to light-green Spongillae (61) became greener (or at least 

 increased in number of green algae) ; but once this did not happen ; 

 h. most green Spongillae (23) maintained their colour; but in 7 

 sponges the green colour diminished (so here the decrease of the 

 algae surpassed the increase). 



2. From 32 Spongillae cultivated in darkness behaved like 



type 



Consequently, in the greater majority of Spongillae, when cul- 

 tivated in darkness, the increase of the green algae proves smaller 

 than the decrease. Accordingly, we saw that in darkness: a. most 

 green to light-green Spongillae (25) lost, or at least diminished, 

 their green colour; only once it remained constant; h. the colour- 

 less Spongillae (6) remained colourless, though in 4 pieces the 

 number of green algae appeared to have somewhat increased. 



B. 1. From 34 Ephydatiae cultivated in light behaved like 



type I 

 „ III 



„ n 

 „ III" 

 „ III 

 .1,111, 



Consequently, in the majority of the Ephydatiae also, when cul- 

 tivated in light, the increase of the green algae proves to sur- 



