ORIGIN AND MORPHOLOGY OF CHLOEOPHYLL CORPUSCLES. 253 



Finally, the idea naturally suggests itself that there may be 

 some relation between the plastids and those small bodies in 

 the protoplasm which were described by Professor Strasburger 

 under the name of "microsomata/^ in his work on the 

 structure and growth of cell walls ; and there are among his 

 figures some which lend support to the idea, while the reac- 

 tions of the microsomata do not differ essentially from those of 

 certain plastids. That there should be any uncertainty on this 

 question shows us two things; first, that the difficulties sur- 

 rounding the study of the origin and relations of those bodies 

 which are included in the protoplasm must be very great ; and 

 secondly, that though remarkable advances have been made in 

 recent years, and have modified the current opinions both of 

 the morphology and the physiology of the bodies included in 

 the protoplasm, there are many essential and interesting 

 points still remaining very obscure ; these we may confidently 

 expect to see cleared up, provided advances are as rapid in the 

 future as they have been in the immediate past. 



DESCRIPTION OF PLATE XXII, 



Illustrating Mr. F. O. Bower's paper " On Ilecent Researches 

 into the Origin and Morphology of Chlorophyll Corpuscles 

 and Allied Bodies.'' 



Pigs. 1—14 are taken from Dr. A F. W. Schimper's memoir, * Bot, Zeit.,' 

 1883°Nos.7— 10. 



Fin's. 15 — 17 are taken from Prof. Schmitz's memoir " Die Chromatophoreu 

 der Algen," Bonn, 1882. 



diffused condition in the cell-protoplasm — as it was hitherto believed in some 

 cases to do — renders the observation by Etigelmaun (confirmed by Miss Sallitt) 

 of the occurrence of chlorophyll in a diffused condition in a green species of 

 Vorticella — of even more striking significance than it had when it was adduced 

 to prove that animal protoplasm can form chlorophyll, and is not dependent 

 for it on parasitic corpuscles.— E. Hay Lankester. 



