Prate IV 
Figs. 40-41. Graft of regenerating tissue. 
Figs. 49-50 Small hydra produced by graft of white tentacle in foot of green hydra. 
Fig. 51 Graft of green tentacle without peristome in white hydra. 
Fig. 52 Graft of green hydranth in white hydra. 
Figs. 53-54 Graft of green and white heads. 
Figs. 55-57 Graft of green foot in white hydra. 
