n.iiiii ()/• ckouiii IX I'l.ixrs 329 



funi^iis root and tin- roots of tlic tree there is an 

 organic connection, a (li\ision of labour which 

 results in the tree rcceix'inf^ from the threarl-hke 

 filaments of the fun<^us {liyphiC) both moisture and 

 certain food stuffs from the ^rounri, whilst the 

 funj^us ^ets in retuin such orj^anic fo(jd as the tree 

 has produced b\- means of its ^reen leaves. Such 

 cases as these [jresent to us a manner of growth 

 that is akin to social habit, and, strange as the 

 union ma}- appear, the circumstance is b)' no means 

 uncommon in the vegetable kingdtjm. Stranger 

 still perhaps is the union that is sometimes to be 

 found between plants and- some member of the 

 animal world, of which union I shall give an 

 example. On one of the larger species of sea- 

 anemones {Anthea ccrciis) are small )-cllowish spots, 

 which at one time were supposerl to lorm part ot 

 the animal it--elf Hut now the spots tiUMi out to 

 be vegetable cells, which can be isolated and 

 induced to continue growing after the death of 

 the anemone. The yellow spots are small alga-, 

 and are furnished with chloroph\ll. We must not 

 regard the algic as parasites on the sea-anemone, 

 because the>- split up the carbon-dioxide under the 



