[167 and 168]

Fig. 21.

Helianthus

N.E. Horizontal glass.

Diagram 2.

Fig 21 1/2 scale no lettering

Helianthus annuus. Fig 21. circumnutation of the hypocotyl, [illeg] below fixed [illeg] along its upper end traced on horizontal glass in darkness, between 8° 45' a.m & 10° 45' P.m. & for an hour on following morning. Filament fixed horizontally cross across summit of hypocotyl. The movement of the bead magnified 21 times or 11 1/2 in the figure given

[168v]

21

Introduction

flowers on the same individual is not an unusual event occasion; it would appear as if it were nature did not think it worth while to devote a distinct individual to the production of pollen, excepting when this was indispensably necessary as in the case of diœcious species.)

(I have now finished my brief sketch of the various kinds of flowers, as far as known to me, which are produced by the same species of plant. Full details will be given in the following chapters with respect to some of the classes & sub-groups of species of plants mentioned in this Introduction. I will begin with the heterostyled, species, & then pass on to certain diœcious, sub-diœcious & polygamous species & end end with the cleitogamic. plants species.

For the convenience of the reader & to save space the less important cases & details are has been printed in smaller type.)

(I cannot close this Introdcution without expressing my warm thanks to Dr. Hooker for his wish always suppying the supply readily suppying me with specimens, & to Mr. Thiselton Dyer & Prof. Oliver for their kind assistance & information. Prof. Asa Gray has uniformly aided me in many ways. To Fritz Müller of St. Catherine in Brazil I am indebted for many dried flowers of heterstyled plants, often accompanied with valuable notes.)

[Forms of flowers, p. 13: "The rarity of such cases as this last one is remarkable, as the presence of hermaphrodite and male flowers on the same individual is not an unusual occurrence; it would appear as if nature did not think it worth while to devote a distinct individual to the production of pollen, excepting when this was indispensably necessary, as in the case of diœcious species.
I have now finished my brief sketch of the several cases, as far as known to me, in which flowers differing in structure or in function are produced by the same species of plant. Full details will be given in the following chapters with respect to many of these plants. I will begin with the heterostyled, then pass on to certain diœcious, sub-diœcious, and polygamous species, and end with the cleistogamic. For the convenience of the reader, and to save space, the less important cases and details have been printed in smaller type.
I cannot close this Introduction without expressing my warm thanks to Dr. Hooker for supplying me with specimens and for other aid; and to Mr. Thiselton Dyer and Professor Oliver for giving me much information and other assistance. Professor Asa Gray, also, has uniformly aided me in many ways. To Fritz Müller of St. Catharina, in Brazil, I am indebted for many dried flowers of heterostyled plants, often accompanied with valuable notes."]