23 



more detailed structure could not be examined because of the 

 small dimensions. Now I can not deny the possibility of their 

 being really nuclei; but to me it seems rather premature to 

 simply declare one, two or more, somewhat irregular spots to 

 be nuclei, on the mere account of being stained violet by hae- 

 matoxyline. One will agree with me, after having read my own 

 observations (pag. 25 — 26). 2. The grafting. Brandt's words are : 

 „Die Stentoren nahmen die griinen Körper alsbald in grosser 

 Menge auf und stiessen sie weder aus, noch verdauten sie die- 

 selben. Sie blieben auch dann griin, als Hr. K. sie fur mehrere 

 Stunden in reines Wasser setzte". I must remark that, if the 

 Stentores have not been observed for more than some hours, this 

 experiment does not sufficiently prove the possibility of grafting 

 the green chlorophyll corpuscles. 



Next we get to Lankester's quite opposite view. The latter 

 says to be convinced (by his morphological investigations), that 

 in Spongilla the chlorophyll is present in corpuscles which are 

 entirely identical to those of the plants, and formed, just as these, 

 by the protoplasm of the cells in which they occur : 1. A nu- 

 cleus can never be shown. 2. When the containing sponge cells 

 are destroyed the isolated chlorophyll corpuscles remain intact 

 (also in plants). 3. It then appears that some protoplasm adheres 

 to every corpuscle; a fact which can be explained in this way, 

 that, when the amoebocytes are destroyed, a lump of protoplasm 

 sticks to each chlorophyll corpuscle ; accordingly, there is no 

 differentiation of a mass of protoplasm belonging to every chlo- 

 rophyll corpuscle to be seen in the intact amoebocyte. 4. It was 

 not possible to discover amylum (by means of I.) within the cor- 

 puscles, but it could be done in other parts of the amoebocytes. 

 5. By lack of sunlight Spongilla remains colourless; it proves 

 that in the otherwise green cells there are then colourless grains, 

 which appear to be chlorophyll corpuscles in a somewhat abnor- 

 mal condition. Lankester thinks it impossible to consider these 

 colourless grains parasitic algae, ready to change into green ones 

 by the action of sunlight. (Finally Lankester critisizes Brandt's 

 conclusions, which criticism Brandt (9) treats in his turn.) 



