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rOPULAR SCIENCE REVIEW. 
a vast array of facts telling all the same tale, that it becomes 
impossible to refuse assent to the Darwinian generalisation, 
“Nature abhors perpetual self-fertilisation.’ 5 * 
EXPLANATION OF PLATE LIX. 
Fig. 1. Feverfew. A central flower just expanded: ( a ) anther-tube closed. 
Fig. 2. Feverfew. A flower somewhat less central: (a) anther-tube broken 
open, and the pollen escaping. 
Fig. 3. Feverfew. A still more peripheral flower. The style projecting 
from («) the anther-tube ; (e) the stigmas exposed ; ( b ) tufts on 
extremities of style. 
Fig. 4. Phascolus coccineus. Front view, (a) standard ; ( b ) right ala, pulled 
somewhat aside ; (c) left ala, cut off at point where it adheres to 
carina ; (e) vertical carina ; ( d ) terminal opening of carina, with 
tip of stigma protruding. 
Fig. 5. Phas. c-occ. Lateral view. Letters as in fig. 4. 
Fig. 6. Phas. c-occ. End of style and stigma, highly magnified : («) stigma 
with hairs round it; (b) long hairs of style; (c) opening at end of 
carina. 
Fig. 7. Fumitory. The two outer petals cut off. A and b the two inner 
petals, united at c and expanded laterally at e into a landing- 
place; f the fissure through which the reproductive organs issue; 
D the diadelphous stamens and the style. 
Fig. 8. Frica tctralix. The filaments not represented excepting cut ends of 
two at d ; (e) ovary; ( e ) hypogynous disk; (6) style surrounded by 
circlet of anthers; (a and a,) these letters point to the processes 
of one and the same anther. So also do (6) and (6). The cell 
to which a belongs coheres with the cell to which b belongs 
externally, in the part removed farthest from the processes. 
Fig. 9. Frica*tetr. Single stamen: lateral view; (a) processes; (b) fila- 
ment, cut short, (c) pore. 
Fig. 10. Vaccinium myrt. Two stamens in situ , showing how the terminal 
pores are set against the style. 
Fig. 11. Vacc. myrt. A single stamen: (a) terminal pores; (6) filament; 
( c ) processes. 
Fig. 12. Arbutus. Two stamens in situ in mature flower; their pores 
against the style. 
Fig. 13. Arbutus. Two stamens in situ in bud : (n) the closed pores. 
The stamen on the left is attached by its sharp end to the style 
by a thread. 
• The various mechanical contrivances described in the preceding paper 
have never, so far as I know, been described before. Hut my acquaintance 
with botanical literature is next to nothing, so that it is quite possible that 
such descriptions may have been given repeatedly without my knowing it. 
Should such be the case, my ignorance must be my apology for passing over 
any previous observations without notice. 
