268 
James Small. 
19. Chrysanthemum corymbosum shows no movement until 
the critical stage when the anther tube is opening, and the style 
is frequently bent as in Doronicum. 
20. The irritability in Antennaria dioica is described by 
Hildebrand (23) as similar to that of the Cynarese, so that it 
probably shows the “ C ” type. 
21. In Helipterum Manglesii the movement towards the touch 
through an angle of about twenty degrees is immediately followed 
by a movement in the reverse direction of about half that 
magnitude. 
22. In Qdontospermnm maritimum the lateral movement is 
rapid, and is accompanied by a rapid ejection of the pollen, cp. 
Mutisieae, note 28. 
23. The movement in Echinops Ritro occurs only before the 
style is exserted, and usually only when the filament itself is touched 
(see note 24). 
24. In Cnicus palustris and most other species the lateral 
movement is greatest when the filament itself is touched, not the 
anther as is usual. 
25. The anther tube in Saussurea Yakla projects above the 
disc just high enough to rub the pollen at the top against the wing 
of a bee while it is standing on the disc. This mechanism is easily 
observed while bees are visiting the flower. 
26. The variation in the movement in Centaurea nigra , some¬ 
times “ B” and sometimes “C,” is partly explained by the behaviour 
of the filaments. When the anther tube is touched at one side all 
the filaments can be seen to become more bent and then to 
straighten out, at the same time becoming shorter. The two stages 
seem to give time for one of the filaments other than the nearest 
one to contract first and the successive contractions give the 
type “ B.” 
27. This exception ( Centaurea pulcherrima) in the genus may 
be explained by the fact that a considerable part of the style is 
free from hairs and the pollen-presentation begins only after the 
exsertion of the style to a considerable degree. 
28. In Gerbera hybrida the pollen is extruded in small 
quantity but more rapidly than is usual in the “ C ” type : the 
movement is towards the touch. In Gerbera Jamesoni and Perezia 
multiflora the outer florets are much more active than the inner, 
and the greatest lateral movement is towards the centre of the 
capitulum. In the former species half the pollen is expelled at the 
first touch and the rest at the second. In the latter all the pollen 
