lEl 



regularly lobated and contained several nucleoli. Further 

 RacilDorskil produced the formation of multi-nuclear giant 

 cells in Basidiobolus ranarum " by cultivating the fungus at 

 30 degrees C. , in 10 per cent, glycerine. At first cell 

 division followed nuclear division, later the former was 

 omitted and giant cells with from 2 to 20 nuclei were pro- 

 duced. (Compare fig, 52) , The last named cases make it 

 evident at once that no sharp boundary may he drawn between 

 the hypertroiphies here named and those cited under 1. 



Aside from enrichment in cytoplasm, no further changes 

 (131) are enacted in general in cells enlarging abnormally. The 

 walls of the multi-nuclear giant cells usually shov/ no var- 

 iation from the normal. In regard to the statements con- 

 cerning thickening of the walls in Heterodera galls (Viul- 

 lemiin and Legrain Log. cit. ) compare Tischler's tcports 

 (loc, cit., p. 105). 



Tischler investigated multinuclear giant cells from 

 the cyto|a»gical side. Attention has been called already to 

 "amitosis through budding" 'which he observed. Reference 

 must be made to the original work, in reggrd to the chromat- 

 in structure of the nuclei, the "pseudo-nucleoli" etc. 

 Amitotic nuclear division occurs also in the giant cells of 

 the germinating seedlings studied by Prillieus. In these, 

 those nuaiei are noticeable, which often divide without any 

 spearation of the individual pieces from one another: "On 

 tfel noyau multiple et hypertrophic presente a peu pres 1* as- 

 pect d* un petit corps pluricellulaire." Figure 53 illus- 

 trates a nucleus of this kind, in v^hich seven pieces may be 

 distinguished. Raciborski proved positibely that the nu- 

 clei of the cells which he studed are produced by karyokin- 

 esis, 



'";i^ Vfeni^ifi^ io^ ill t3i« atea of "^uxa ^^ ^iwjj 



ceXXa " (iBulti^nucleart ) iittlolj ejBoeed«4 the voxabbo or noaaaa* 

 oellfi 1>y *'un6 oentaine d« foia". Sftrasitas do not eeeoi to 

 have taken part in their formation. 



I4 Raciborski, Ueb, d, Einfl. auss. Bedingungen auf die 

 Hachstumsweise des Basidiobolus ranarum. Flora, 1896, Bd, 

 IiZXXII, p. 113. 



E. Notes de pathologic veget. G, R. Soc. Bot. Belgique, 

 1897, T. XXXVI, p. 249. 



