Curvature of Roots. 
45i 
EXPLANATION OF FIGURES IN PLATE XXII. 
Illustrating Prof. Spalding’s paper on Traumatropic Curvature of Roots. 
Fig. 1. Lupinus albus in germination, the radicle showing traumatropic curva- 
ture at a, and the mechanical bend at x. 
Fig. 2. Radicle of Vicia Faba branded 1 mm. from the apex. 
Fig. 3. Radicle of Vicia Faba branded 2 mm. from the apex. 
Fig. 4. Radicle of Vicia Faba branded 2-5 mm. from the apex. 
Fig. 5. Radicle of Vicia Faba branded 4 mm. from the apex. 
Fig. 6. Aerial root of Anthurhim sp. in longitudinal section while undergoing 
traumatropic curvature. Magnified three diameters. Tracheids may be distinguished 
as far as t. 
Fig. 7. Diagramatic longitudinal section of the end of radicle of Vicia Faba. 
The section a a lies partly within the growing-point ; the section a ’ a' lies wholly 
within the root-cap. 
Fig. 8. Lupinus albus . Radicle thirty hours after release from a cast in which 
it had been confined twenty-two hours after previous branding. 
Fig. 9. Lupinus albus. Radicle six hours after release from a cast in which it 
had been confined forty-seven hours after previous branding. 
Fig. 10. Same specimen forty-eight hours after release from cast. 
Fig. 11. Lupinus albtis. Radicle twenty-four hours after release from a cast in 
which it had been confined seventy-two hours after previous branding. 
Fig. 12. Lupinus albus. Radicle twenty-two hours after release from a cast in 
which it had been confined 146 hours after previous branding. 
Fig. 13. Lupinus albus. Radicle eighteen hours after release from a cast in 
which it had been confined eight days and six hours after previous branding. 
Fig. 14. Same specimen forty-one hours after release from cast. 
Fig. 15. Zea Mais. Radicle twenty-four hours after release from a cast in which 
it had been confined seventy-two hours after previous branding. 
Fig. 16. Same specimen forty-eight hours after release from cast. 
Fig. 17. Same specimen enlarged, showing dead tissue x, about to be thrown 
off in the process of regeneration of the root-tip. 
Fig. 18. Lupinus albus. Radicle twenty-three hours after release from a cast 
in which it had been confined twenty-six hours, and afterwards branded. 
Fig. 19. Same specimen forty-seven hours after release from cast. 
