426 ELEMENTARY BIOLOGY. [CHAP. 



c. The aerial hyphae and conidiophores. 



Tease out in water a bit from the surface of one of 

 the greenish patches; observe the difficulty with 

 which water wets it. Examine with low and high 

 power. 

 Note; 



a. The primary erect hypha. 



ft. Its division into a number of branches. 



y. The division of the terminal branches by con- 

 strictions into a chain of conidia. Draw. 



d. The conidia. 



a. Their Size (measure). 



form; spherical. 



Structure; cell-wall, protoplasm, vacuole, 



and nucleus. 



b. Stain different specimens with magenta, haema- 

 toxylin, and iodine, to bring out the above 

 points of structure. 



c. Treat another specimen with potash. The cell- 

 contents gradually disappear. 



e. The germination of the Conidia, and building up 



of the Mycelium. 



a. Sow some conidia in Pasteur's fluid in a watch-glass; 

 protect from evaporation, and watch the development 

 of the mycelium (examine the surface with a low 

 power) ; then the formation of aerial hyphae ; finally 

 the production of new conidia. 



b. Sow Conidia in Pasteur's fluid in a moist chamber, and 

 watch from day to day; note the formation of eminences 

 at one or more points on a conidium ; the elongation of 

 these eminences to form hyphae; the branching and 

 interlacement of the hyphas. 



