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Ivi 



THE BEGINNINGS OF LIFE. 



circumstances continuing the same, proceed in the same 

 direction for an unUmited time/ Dr. Hicks tells us still 



further that 



When 



\ 



mation, are placed in water, the mucous envelope becomes 

 much increased in diameter, the cells become more numerous 

 and smaller, and assume the appearance of Hematococcus 

 alpesirts. It proceeds sometimes to such extreme division 

 that the process seems almost indefinitej and the results 

 resemble Hematococcus therzacus, and minutissimus^ Hass.' 

 Segmentation goes on, in fact, in various ways, and the pro- 

 portion that the mucous coat bears to the cell is exceedingly 

 variable. At other times a group of large oval cells is pro- 

 duced, each of them surrounded by a mucous layer, precisely 

 similar to the Palmoglea of Kutzing {Coccochloris, Hassal). 

 The common mucous envelope soon disappears, and then 

 the contained cells rapidly subdivide and form an indefinite 

 mass resembling C. Brebissonii. Dr. Hicks believes that 



r - 



even the Gleocapsa cells may and do, ' by the condensation or 

 desiccation of the mucous sheath and by the enlargement of 

 the green cell, ultimately revert to the form of the original 

 gonidium from which they arose.' He is disposed to believe 

 that the changes above detailed are by no means all that may 

 occur. Sometimes, indeed, the whole of the gonidial layer 

 of the lichen-thallus becomes converted into a Palmogl(Ea- 

 mass, which, after a time, is indistinguishable from other 

 masses produced from soridia. Observations of a somewhat 

 similar nature, though more limited in extent, had also been 



J 



— of which, however, Dr. Hicks 



was ignorant till at a late stage of his own investigations. 

 These have convinced him that the gonidium of a single 

 Lichen may, under the influence of suitable but varying 

 conditions, give rise to products absolutely resembling almost 



* *Botan, Zeitung/ Jan. 5, 1855. 



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