THE MYCETOZOA 



small rounded lobes of hyaline substance are seen to start forward, 

 and then to become stationary, as though the surface tension had 

 momentarily been overcome by the pressure from within, and had 

 then been rapidly renewed. It is to be observed that the contents 

 of such a newly-formed lobe are at first not, as might have been 

 expected, the granular protoplasm which flows in the " veins," but 

 they are hyaline, the passage of the granules into the interior of 

 the lobe occurring subsequently. 



The material in the " veins " appears to be of highly fluid 

 consistency, the granules moving over one another with great 



FIG. 7. 



((, part of a stained plasmodium of B. utricularis. n, nuclei, x 110 ; b, nuclei, x 500. Some 

 Are in process of simple division, c, part of a plasmodium in which the nuclei are in simul- 

 taneous division by karyokinesis. <?-/, other stages in this mode of division, x 650. 



freedom. When a small channel is watched it frequently occurs 

 that an ingested sclerotium cyst or other large object blocks a 

 narrow part, and the flow in the channel is temporarily checked. 

 If the object ultimately passes on, its passage is followed by a 

 gush of the protoplasm behind it, at increased velocity, the flow 

 gradually resuming its normal rate. When a vein traversing a 

 continuous portion of the plasmodial film is examined the flow is 

 seen to be rapid at the centre and slower at the sides. 



The phenomena presented by the circulation in the veins suggest 

 the view that their contents are passively propelled, as the result of 

 the contraction of the more external part of the plasmodial substance. 



