414 



PROP. ALLMAN ON THE RECENT RESEARCHES 



succession of undulations may be then noticed passing along the 

 course of the threads ; and under higher magnifying -powers the 

 characteristic sarcode currents show themselves in constant 

 streams of granules flowing along the threads and streaming from 

 branch to branch of this wonderful network. Here and there 



Fig. 9. 



Development of the MyxomycetcB. 



A, the Plasmodium of Bidymium serpula (natural size). B, sporosacs oiArcy- 

 ria flava : a, young sporosac ; «*, sporosac in the act of bursting ; b, capillitium 

 exposed after the bursting of the sporosac and the diffusion of the spores. C, 

 ripe spore of Physarum album. D, the same, with its contents escaping. E, 

 the contents become free, and showing nucleus and contractile vacuoles. 

 F, the same, after having developed a flagellum and assumed the condition of 

 a swarm-spore. G, the swarm-spore become Amoeboid. H, two Amoeboid 

 swarm-spores in close juxtaposition. I, the two AmoebcB fused together into a 

 young Plasmodium. J, the plasmodium more advanced ; it has already begun 

 to ramify and to take in nutriment : two nutriment-pellets are seen imbedded 

 in its protoplasm. (After Greville and Cienkowski.) 



