THE ROOT 



33 



and, alongside it, a piece of cardboard, so arranged that 

 the surfaces of root and cardboard are on the same level. 

 With a fine camel's hair brush and Indian ink make a 

 number of fine lines on the root, and a corresponding set 

 on the cardboard, commencing as close to the tip of the 

 root as possible, and continuing them backward for about 

 one inch. These lines should not be more than th inch 



FIG. i. Mode of 

 measuring growth 

 in length of the 

 root of a germinat- 

 ing bean. 



FlG. 2. Germinating bean 

 fixed in a glass jar by 

 means of a pin passing 

 through the cork. The 

 root is marked into equal 

 transverse divisions at the 

 beginning of the experi- 

 ment. After a period of 

 about twenty-four hours 

 the region of most active 

 growth may be ascertained. 



apart, and in marking them great care must be taken not 

 to injure the root. Place each bean in a thistle-funnel 

 standing upright in a tumbler or bottle of water, and 

 cover the top of the funnel with a watch glass, or small 

 piece of wood (see Fig. i). 



As an alternative method, pin the seedling, with the 

 root hanging vertically, on the inside of a box or bottle, 

 the atmosphere in which is kept moist, as in the experi- 



C 



