18 INTRODUCTION TO CRYPTOGAMIC BOTANY. 



ber of bodies, always multiples of four when he is able to count 

 them, except when in a state of transition ; these bodies at length 

 separate, and to his astonishment he sees them of different 

 sizes moving about with great raj^idity by means of two long 

 slender appendages. The motion at length ceases, and the 

 bodies soon swell and repeat the same phases. (Figs. 8, 9.) 



Fig. 8. Fig. 9. 



Fig. 8, a. Protococcus pluviulis, Flotow, immersed in water after 

 having been jierfectly dry, magnified. 

 h. Ditto, with the endochrome divided into two. 



c. Ditto, divided into fonr, the central nucleus red, the border 



green. 



d. Separate spore, with two flagelliform processes. 

 Fig. 9, e. Cell containing eight scarlet spores. 



/. Ditto containing numerous green spores. 



g. Ditto with a scarlet spore in its cavity, furnished with 



flagelliform processes. 

 h. Two spores, green below, scarlet above, all more or less 

 magnified. 

 From Colin Nachtrage zur Naturgescliichte des Protococciis pluvialis, 

 Flotow. 



His difficulty now is to say whether he has an animal or 

 vegetable before him, e. But a very few days previously he 

 had found in the neighbouring water tub a mass of green 

 threads,* of which he has ascertained the purely cellular 

 structure, the acrogenous growth, and finally, the formation 

 of spores from some of the joints ; and these, when free, he has 

 seen moving about by means of a little coronet of filaments, 

 and then, like his red globules, subsiding into rest, and germi- 

 nating by a single thread which soon acquired joints, and was a 

 complete reproduction of the parent filament. He is then satis- 

 fied that his red globules also belong to the vegetable world, 

 though exliibiting certain attributes usually supposed to belong 

 * Ulothrix mucosa, Thuret. 



