74 



colourless sponge in darkness: 



IV. Why does the number of the various (green and colourless) 

 algae always shotv a decrease in the gemimde stage ? 



As for the green algae, we may symbolize the transition of a 

 colourless sponge in darkness into the gemmule stage as follows : 



i i + r + mu = e + g ^ mo 



j II II II II II II 



1/+0+0 = + g + mo 



V A II II V 



young colourless gemmule in darkness : 0+/'+0 0+0+ mo 



I II V 11 II II V 



old colourless gemmule in darkness : 0+0 + <(0 + + mo 



\ A II II II A A 



germinated gemmule in darkness : i + 0+0 + (/ + mo 



Consequently the green algae must entirely disappear from old 

 colourless gemmules in darkness, in order to re-appear immediately 

 in small numbers, when the gemmules have germinated (conf. 

 pag. 47, 3). 



The transition of a green sponge in light into the gemmule 

 stage may be symbolized : 



■ i + r + mii = e + g -i- mo 

 green sponge in light: -» II II II II II II 



^ + O + mu = e -\- g -\- mo 

 VA V V 



young green gemmule in light : O + r + mu O + O + mo 



I II V V II II V 



old green gemmule in light : 0+0+0 <(0 + + mo 



J A II A A A A 



germinated gemmule in light : / + O + mu e -\- g -\- mo 



Consequently, the number of green algae must decrease in old 

 green gemmules in light, but probably increase immediately after 

 the gemmule has germinated (conf. pag, 46, 2). The fact, that 

 the multiplication of the algae stops in old green gemmules, is 

 stated on pag. 46, "Z, There are several reasons possible for it; 

 none of them can be proved, however. 



