64 



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

 type I+IIi 63 = + 89' 



„ II 1 = + 1°/ 



„ Ilm + m 7 = + 10% 



'°/o 



o 



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

 vated in liglit, 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 groener (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 



1=4= + 13% 



type I O 

 „ IIi 4 



„II 3=3=+ 9% 



lm 23 1 = 25 = ± '«°/° 



• 



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 14 

 . IIi 4 



= 18 = + 537, 



0/ , 

 o 



o / 



II 4 = 4 = + 12 



Iliir 4 



III 4 ! = 12 = + 35° 



o 



o 



„i,ni, 4 



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

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



