^S: 



''^^g guess tu* 

 ' ^f the libe,; 



rtant 



point, 



fact that 



cells of ^ 

 St exhibit a!ffi:5 

 , though aftei;' 

 . the moveiEE 



ts seen pea:: 

 lis of Spirof 

 opment of loi' 



I 



lave a writfc 

 ^;rth-fforiii, t^ 

 It appearand '■ 

 that sucli 



tH 



in 



£ The S'; 

 ai5#"' 



into 



e-^.-^:: 

 <-'" 



[jt"'' 



rhe 



an 



d nee* 



r^^ BEGINNINGS OF LIFE. 



393 



putrefaction has commenced.' Mr. Archer has also 

 described and figured^ a mycelial growth found within 

 a Closterium lunula, which was very similar to the organ- 

 isms just referred to 2. 



In speaking of the prevalence of one or other of the 

 modes of development already described^ Mr. Carter 



r 



says they are common in Chara and Nitella^ and in 

 Cladophora and Spirogyra; that they occur occasionally 

 in Hydrodictyon^ and also in Closterium and Cosmarium 

 among the Desmidise, though never in the Diatomacex. 



■ 



He has also frequently met with such 

 Euglense^ and in the dead bodies of Furcularian Roti- 



or similar develop- 

 ments probably take place throughout the whole of the 

 fresh-water Algse, and in many of the Infusoria/ 



changes 



in 



fera ; and he adds : 



The 



same 



Changes very similar to^ though not precisely the 

 same as those already described^ have been frequently 

 watched by the author in Nitella^ Vaucheria^ and other 

 Alg^. And those who work at this subject must not 



^ * Journal of Microsc. Science,' i860, pi. xi. fig. 6. 



^ I have myself very frequently seen these growths within large speci- 

 mens of Closteria, though the filaments have always been quite motion- 

 less. They seemed to be formed out of the substance of the Desmid, and 

 always first manifested themselves near the clear central portion at a 

 time when no alteration of colour had taken place. I have occasionally 

 found that their presence could be determined at will by simply keeping 

 the Desmids for a time beneath a covering glass, or in a small unven- 

 tilated chaniber. Under these conditions also, fungoid growths of various 

 kinds will make their appearance within the filaments of Spirogyra, 

 Vaucheria, or other Alg^; whilst other heterogenetic changes which 

 may have been previously taking place become arrested. 



