85 



With a view to what we shall treat later on, I want to add, 

 tliat here almost exclusively algae were examined, which were 

 situated free in the protoplasm of the lodging amoebocytes, so 

 not in vacuoles. 



3. Also in the amoebocytes of green sponges, so in amoebocytes 

 overladen with green algae, there occur numbers of refractive 

 oildrops lying free in the protoplasm; eee Table 12 and 13. They 

 are not stained by I in I K sol., but they become red with sudan 

 III in alcohol and gray-black with osmic acid (see note p. 25), 

 and are blue-green, when not stained and the microscope is well 

 adjusted — just as the oildroplets of the algae. They also have 

 the same diameter (0.4 — 1 /y.) as these ones, although the larger 

 specimina seem to occur more in the algae than in the amoebo- 

 cytes. Further the oildroplets of the amoebocytes very often 

 seem to be still much more refractive and sharper outlined than 

 those of the algae. This might show, that the oildroplets from 

 alga and amoebocyte are not identical. 



Next I want to mention that, although these „oildroplets" 

 (of alga and sponge) will consist for the greater part of oil, 

 one still has to consider the possibility, that they might possess some- 

 thing as a plasmic stroma or cover, as is also given for instance 

 for the milk-globules. Also the above mentioned (p. 26) colouring 

 of the oil-droplets by haematoxyline makes us think of that. 



4. How often I have paid attention to it, I have never been 

 able to see the slightest tracé of an oildroplet being ejected by 

 the symbiotic algae. Also the supposition, that such a phenomenon 

 miglit be possible, does not sound very likely — for we have 



