ON THE POWER OF MOVEMENT IN PLANTS. 143 



Plate XIX. 



Fig. 10. — Lobe of the Corolla, x 15, and some of the glandular hairs 

 from the same, x 200. 



11. — Sepal, X 15. 



12. — Three of the Stamens, x 15. 



13. — Pollen, X 285. a, Diagrammatic representation of a section 

 of one of the grains. 



14. — Ovule, X 20. a, Portion of same, x 200. 



15. — Cellular structure of the Capsule, x 200. 



16. — Seeds (opaque), x 20. 



17. — Development of the Seeds, after Sachs. 



a, Longitudinal section of flower-bud, showing, 1, Sepal ; 2, 

 Corolla ; 3, Anther ; 4, Carpel ; 5, Apex of Floral axis. 



h, Gynoecium further developed. 1, Stigmatic formation ; 

 2, Ovular formation. 



c, Section of Pistil and Ovary. 1, Pollen ; 2, Stigma ; 3, 

 Style ; 4, Central Placenta ; 5, Ovules. 



d, Fruit (unripe). 1, Placenta, fleshy and swollen, and fill- 

 ing spaces between Ovules ; 2, Ovules. 



,, 18. — a, Transverse section of seed (from a stained specimen, 

 x 30. 

 h, Crystals in Testa seen by polarised light, x 200. 



®n tbe power of flDovement In plante* 



By H. W. S. Worsley-Benison, F.L.S., 



Lecturer on Botany at Westminster Hospital ; Late President of 

 the Highbury Microscopical and Scientific Society. 



THE power of movement in some form or other is an essetitial 

 condition of life. We are quite unable to think of the two 

 things apart from each other. I do not say that the movement is 

 always spontaneous^ or that it is the result of volition ; far from it. 

 Neither do I say that it must needs involve in all cases a change of 

 place, or that it even extends throughout the 7vhole organism, 

 although this is in scores of instances exactly what takes place. 



I speak just now concerning the phenomenon of motion as 

 seen in the plant-realm, whether in part or as a whole \ whether 



