48 BOTANICAL GAZETTE [ruLy 
EXPLANATION OF PLATE I. 
Fic. 1. Longitudinal section of a corn root, grown in a glass tube: a, X45; 
b, two hair-producing cells lapping over the other epidermal cells, X 220. 
Fic. 2. a, Longitudinal section of a corn root, grown in air; the section 
shows more than one line of epidermal cells with long and short hairs; X75. 
b, rounded surface of a living root of corn, grown in redistilled water; the out- 
lines of the epidermal cells were aes indistinct; the only case observed where 
the difference in size was so great; X45. 
Fic. 3. Roots of wheat plants which had been cut from the seeds shortly 
after sprouting; water culture; 4. 
Fic. 4. Longitudinal section of a root of corn, grown in air, showing the 
origin of hairs from the region where the cells are still short; 220. 
Fic. 5. Longitudinal section of a root of corn grown in water, in the same 
experiment with the root shown in fig. 6; X45. 
Fic. 6. Longitudinal section of a root of corn grown in air, in the same 
experiment with the root shown in fig. 5; 45. 
Fic. 7. Longitudinal section of a root of corn grown in air, showing the 
beginning of the hairs; X 220. 
Fic. 8. Longitudinal section of a corn root curving on the surface of water; 
X 34- 
Fic. 9. Longitudinal section of a corn root grown in air, showing one of thes 
large nuclei of the hypodermal cells; 220. a 
