■^^::^ 



MB. F. CUEBEY ON A SPECIES 



becomes attached to the apex of the stem precisely in the spot 

 usually occupied by the vesicle, and it is not always easy for the 

 observer to teU whether he is looking at the vesicle itself or at a 

 substituted drop of water. 



The second appearance alluded to above is not so easy of 



planation 



drop 



has just been mentioned, sometimes occupy the place of the 

 vesicle, I have several times seen a small orange-coloured body 

 revolving with more or less rapidity, but having rather the ap- 



pearance of being carried round and round by the force of a 

 current than by any volimtary motion. This, or a similar ap- 

 pearance, was noticed by Ehrenberg, and described by him in 

 a paper published in 1823, in Kruze and Schmidt's *Mykolo- 

 gische Hefte* ; he did not however ascertain what the revolving 

 body was, and only endeavoured to explain its rotation by attri- 

 buting it to some unknown physical agency which kept the drop 

 of water in perpetual revolution. I was very desirous of ascer- 

 tMuing the nature of this moving body, and tried to detach it 

 from the drop of water.' This attempt was not successful, but I 

 managed to float a drop entire with its orange-coloured occupant 

 on to a piece of white paper, and then waited for the water to 



to leave the object high and dry. How- 



dried 



granular orange-coloured particles 



surface 



paper 



cause 



gular rotation, I can offer no conjecture 



directing 



further attention to this curious phsenomenon. It is interesting 

 to notice the resemblance in point of structure between the genus 

 Piloholus and the fungus which causes the fin-nntd epidemic 



igst the House Flies 



Filoholus 



thrown off is the mother-cell of innumerable 



produced. It is possible 

 ie cell in the Errypusa maj 

 nctive narticles after sepa 



ration from the parent plant : and 



admit 



gainm. 



ding to Dr. Cohn's account in a late naner'i the first 





are 





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