ERRATA. 



Page 1 8, line 3 from bottom, for Chini read Ghini 

 ,, 20, ,, 7, for Schmiedel read Schmidel 

 160, ,, 2 from bottom, for many read some 

 ,, 160, note,yi>r Robert read Louis Marie Aubert 

 ,, 201, line i\, for asexually read sexually. 



