CHLOROPHYLL-CORPUSCLES AND AMYLOID DEPOSITS. 247 



in the surrounding protoplasm of the cell. In Spongilla, 

 under certain circumstances, it is deposited as amyloid sub- 

 stance (after diffusion) in the large vacuoles described above 

 and figured in PI. XX, figs. 1, 3, 4, 14. 



Now it appears not improbable that by removing the 

 chlorophyll-corpuscles from the mass of surrounding proto- 

 plasm. Dr. Karl Brandt has found a method by which the 

 product of the activity of the chlorophyll-corpuscle may he, as 

 it were, forced to remain in the corpuscle, there being no 

 surrounding protoplasm to take it up and operate further 

 upon it. Hence, possibly enough, we get a deposit of starch- 

 grains in the isolated corpuscle which would never occur in 

 the normal condition, since the product of assimilation is in 

 that condition rapidly diffused and so removed from the 

 chlorophyll-corpuscle. 



The inquiry suggested by Dr. Brandt's observation on 

 this point seems likely to have valuable results. 



With regard to Dr. Brandt's experiments in infecting 

 Infusoria with the supposed parasites of Spongilla and 

 Hydra (paragraph 5), it is at once apparent from his account 

 of them that they are opposed to and not in favour of the 

 parasitic theory. 



The chlorophyll-corpuscles of Spongilla were digested or 

 else ejected by the infected Infusoria. In other cases the 

 chlorophyll-corpuscles of Hydra remained in the Infusorian's 

 body unchanged. Had Dr. Brandt's view been confirmed, 

 the green-corpuscle ought to have multiplied in its new 

 host, and even such evidence of a temporary manifestation 

 of vitality after removal from the Hydra or Spongilla would 

 not in my opinion be at all conclusive to the effect that the 

 chlorophyll-corpuscles are independent organisms, and not 

 parts of the protoplasm of the cell in which they are 

 normally found. 



Hydra viridis. 



Professor Nikolas Kleinenberg, in his memorable work on 

 ' Hydra,' has given an account of the chlorophyll-corpuscles 

 of H. viridis, which leaves little to be added on the subject. 

 He has not, however, given any of the special features of 

 the chlorophyll-corpuscles in his plates, and the figures 

 which are given in my PI. XX, figs. 15 — 27, are, I believe, 

 the first which adequately represent those bodies. Kleinen- 

 berg says of them : 



"They consist of (1) a dense ground-substance, very rich 

 in albumens, which stains dark brown with iodine, deep 

 red with carmine or aniline ; (2) and spread over this an 



