276 



THE BEGINNINGS OF LIFE. 



from a certain pestilential disease 1 ; and although they 

 may, as M. Davaine imagines, exhibit close affinities 



FIG. 19. 



Oscillatorice and other simple Fresh-water Algae (Hassall 2 ). These 

 forms are known by the following names : 



a. Lyngbya prolific a. e. Microcoleus gracilis. 



b. vermicularis. f. Oscillatoria autnmnalis. 



c. Raphidia viridis. g. splendida. 



d. Tolypotbrix rufescens. b. Spirillum Jenneri. 



i. Nostoc commune. 



to the low algx known as Oscillatoritf, they, on the 



1 The ' Miltzbrand,' ' sang de rate,' or ' the blood,' as it is called in 

 different countries; and from the contagion of which the Malignant 

 Pustule of man is produced. 



2 Selected from Hassall's 'British Fresh -Water Algae,' in order to 

 show the simple structure of the filaments. 



