WHITE RUSTS. 129 



doubt that a true vegetable produces from itself 

 bodies endowed with active motion, resembling low 

 forms of animal life, and yet in themselves not 

 animalcules, as some would suggest, but essentially 

 vegetable, as we shall hereafter demonstrate. To 

 scientific men this is not new, except as regards 

 fungi, for in algae such bodies have long been 

 recognized. 



A second kind of reproductive organs are de- 

 scribed by Dr. de Bary ; and if future examinations 

 confirm his observations, as they doubtless will, 

 this feature is an important one. It is true that 

 M. Caspary long since detected similar bodies in 

 moulds (allied to that which produces the potato 

 disease), but he only knew tJiem in a limited sense 

 compared with what De Bary has revealed. These 

 fruits are hidden amid the tissues of the plant on. 

 which the '^ white rust " is parasitic, and only 

 betray their presence by the coloration of those 

 tissues. To these bodies it is proposed to give the 

 name of ^^oogonia^^ and ^^ antheridia,^' on account 

 of their presumed sexuality, the "oogonia'^ repre- 

 senting the female, and the ^' antheridia '' the male 

 organs. 



The oogonia aro large spherical or ovoid cells, 

 with a thickish membrane containing a granular 

 protoplasm, or formative fluid. They are produced 

 either terminally or laterally upon the threads u'J 

 the mycelium, from which they are separateu b^ 

 septa or partitions. 



K 



