8^ 



green colour, so in a concentration s. of the algae, the intensity 

 of multiplication is the same in the sponge as in the water- 

 culture, viz. about — 6.5 (once 9), on the average 2 in 

 the sponge, in water 2.3 ; with a yellow-green to light-green 

 colour, so in a concentration m., in water about 7 — 20 (once 28), 

 13 on the average; with a greenish colour, so in a concentration 

 iv., in water about 29 — 39 (once even 45) and 33 on the average. 



We should also apply this method to Table 10 and first to the 

 sponges in light, considering again both, begin- and final con- 

 centration of the algae. We then find in a concentration s. — s. 

 of the algae in the sponge a multiplication-intensity (in 22 

 out of the 23 cases) of about — 7 (once 9), 2.6 on the average ; 

 in a concentration m. — S. (in 14 out of the 18 cases) of about 

 5—11 (once higher, 3 times lower), 7 on the average; in a 

 concentration w. — m, (in 12 out of the 15 cases) of about 9 — 17 

 (once lower, twice very low), 10.7 on the average; in a concen- 

 tration IV. — s. both very low values for the intensity of 3 and 7 ; 

 and finally in a concentration w. — w. (in 3 out of the 4 cases) 

 an intensity of about 15 — 20 (once lower), 15.5 on the average, 

 while the experiments n°. 3361, 341, 36511, 3751, 3761, with 

 the concentration w. — w. and their multiplication-intensity of 0, 

 should be neglected as being abnormal (p. 75 — 76). For the cul- 

 tures in water from the conduit in light we find: in a concen- 

 tration s. — s, an intensity of 1 ; in a concentration m. — m. of 

 11 — 23, 15.7 on the average; in a concentration w. — tn. of about 

 19 — 28, 23 on the average; and in a concentration w. — W. an 

 intensity of about 17 — 37 (once 10), 25.2 on the average. For 

 the cultures in lake water these values are generally lower ; as 

 also in Table 9 B. 



One will acknowledge that, considering the rather coarse way 

 of comparing the concentrations of the algae in the sponge tissue 

 and in the water cultures, their multiplication-intensities for the 

 strong concentrations (■§. — s. and m.— s.) in sponge tissue and in 

 water do mutually correspond very well in Table 9 A and 10'); 



1) In fact we ought to have stated them separately in Table 10 for each series of 

 experiments (p. 54); the result, however, would have been the same. 



