48 



BOTANY. 



Fig. <&.Peronospora alsinearum. A , young oogonium o, and young autheridium 

 n, in contact with it ; .B, the antheridiuin n beginning to pierce the oogonium o, whose 



protoplasm is becoming condensed ; C, t&e fine tube of the antherimum n has pen- 

 etrated the oogonium o, and come in contact with its condensed and rounded proto- 

 plasm, the ooi-phere. X 350. After De Bary. 



B 



FIG. 40. 



FIG. 41. 



Fig. 40. Female reproductive organs of a moss, Funaria hygrometrica. A, apex 

 of the stem; a, arche-ionia ; b, leaves: S, archegonium ; o, base; A, neck; m, 

 mouth ; C, mouth of fertilized archegonium. A X 100, X 550. After Sachs. 



Fig. 41. Male reproductive organs of the same moss. A, antheridium open and 

 permitting the ppermatozoids a to escape ; B, b. sperm-cell of another moss (Polyiri- 

 chum), with contained spermatozoid : c, ppennatozoid free, with two cilia at the 

 pointed extremity. A X 350, B X 800. After Sachs. 



