MUSHEOOM 307 



gills are dark-brown or black, lay it, gills down- 

 ward, on a piece of white paper, and cover with 

 a bell-jar or tumbler. After five or six hours re- 

 move the pileus, and note the " print " of its under 

 surface made upon the paper by the spores. To 

 what do the dark lines correspond ? To what the 

 white ? "With a needle place some of these spores 

 in a drop of water, and examine under the high 

 power. "What is their shape ? Structure? Color? 

 Draw several. Pull off a single gill and lay it on 

 a slide without the drop of water and cover-glass. 

 ISTote the spores, many of them detached from 

 the sterigmata. "What is the color of the tissue 

 of the gill? To what is the color of the under 

 side of the mushroom due? 



General Questions. — Eeview the whole structure of 

 the mushroom. Do you find the aerial fruiting portion 

 to be anything more than a collection of hyphse, at the 

 tips of some of which spores are borne ? In what va- 

 rious ways do the blue mould and the mushroom resem- 

 ble each other ? "What do you consider to be essentially 

 their points of difference? Can the blue mould and the 

 mushroom obtain their food in the same manner as 

 green plants ? Are they dependent upon the sunlight ? 



