0^ 



lip 



K 



t 



bout, "s; 



APPENDIX D. 



Jxxiii 



2 



that the 



be 



parent 



^«?iBe»ti 



ii[ 



Aft 



^^ a time 



^^K\ ,. ' ' 



i!|; 



'^^'le anything/ 



■ came to \^ 

 These 



dete 



that thej 



ed. . 



they differed sligt|. 

 "e, however (and fc 

 ey possessed tw tt 



The smaller 



measa 



from every 



h-^ 



h'' 



mav 





spring lip 

 occasionally the =|^ 



teto 



form 



theit 



lU /" '^ 





-e the ten""^^' 



the filaments, the power of separating from the others, and 

 frequently it might be noticed that the cells had already 

 begun the process of division before their separation. The 

 production here of gonidia seems to result from a kind of 

 arrest of development. 



But Dr. Hicks speaks of still another mode by which free 

 cell elements may originate, when he says: — 'I have fre- 

 quently noticed that Gleocapsa-like cells are produced from 

 the contents of the cells of the older leaves, which, situated 

 at the base of the stem, towards autumn and during winter 

 and spring, have become brown. These leaves are not 



wholly dead. 



« * « 



After a time the old cell-wall dissolves 



away, and then it becomes evident that the contents have 

 assumed the form of, or rather have become a Gleocapsa 

 which certainly undergoes segmentation freely.' He has 

 seen considerable masses of Gleocapsa which have had this 

 mode of origin. 



Lastly, Dr. Braxton Hicks says^: — 'It seems to me 

 '. the reproductive p j impossible to discriminate between the cells of the seg- 



ition of gonidia 

 he power of prot. 



Mos 



and 



hence I believe we shall be obliged to conclude that all the 



trts. These bofc:I cells classed as V2Xmd\2.c(t^~Chlorococcus, Gleocapsa, Soro- 

 ,ves of Mosses, ji't il spora, and some others, with their so-called species— are but 



0/ 



of one mode of 



What 



ences between each kind it seems difficult to decide, but it 

 may possibly be less than hitherto supposed.' 



The transformations of the gonidia of Mosses are, how- 

 ever, far outstripped by the metamorphoses of the antheridia 

 of Liverworts, if we are to rely upon the observations 



\ \^'-- "t- p. 584. 



we has also seen growths of this kind originating by the 

 rauitiplication of certain spores of Volvox. See p. Ixxxviii. 



segmental 



