or DIATOKPHIC XSD TJlIMOKPillC I'LANTS. 397 



and of unequal sizes. I observed, under the circumstances imme- 

 diately to be stated, the number of seeds produced by six plants 

 (JEa:^. I to VI.) in the first lot of eight plants, and by three plants 

 in each of the other two lots belonging to the present class. 



Experiment I. This long-styled plant was allowed during 1863 

 to be freely and legitimately fertilized by an adjoining illegitimate 

 mid-styled plant, but it did not yield a single seed-capsule. It 

 was then removed and planted in a remote place close to a brother 

 long-styled plant Xo. II., so that it must have been freely though 

 illegitimately fertilized ; under these circumstances it did not 

 yield during 1864 and 1865 a single capsule. I should here slate 

 that a legitimate or ordinary long-styled plant, when growing 

 isolated and freely, though illegitimately fertilized by insects with 

 its own pollen, yielded an immense number of capsules, which 

 contained on an average 21*5 seeds. 



Eocp. II. This long-styled plant, after flow^ering during 1863 

 close to an illegitimate mid-styled plant, produced less than 

 twenty capsules, which contained on an average between four and 

 five seeds. When subsequently growing in company with No. I., 

 by which it will have been illegitimately fertilized, it yielded in 

 1866 not a single capsule, but in 1865 it yielded twenty-two 

 capsules : the best of these, fifteen in number, were examined ; 

 3ight contained no seed, and the remaining seven contained on 

 an average only three seeds, and these seeds were so small and 

 shrivelled that I doubt whether they would have germinated. 



Exp. III. & IV. These two long-styled plants, after being freely 

 and legitimately fertilized by the same illegitimate mid-styled 

 plant during 1863 were as miserably sterile as No. II. 



Exp, V. This long-styled plant, after flowering in 1863 close to 

 the illegitimate mid-styled plant, yielded only four capsules, which 

 altogether included only five seeds. During 1861, 1865, and 1866, 

 it was surrounded either by illegitimate or legitimate plants of 

 the other two forms ; but it did not yield a single capsule. It 

 was a superfluous experiment, but I likewise artificially fertilized 

 in a legitimate manner twelve flowers ; but not one produced a 

 capsule ; so that this plant is almost absolutely barren. 



Exp. VI. This long-styled plant, after flowering during the 

 favourable year of 1866, surrounded by illegitimate plants of the 

 otlier two forms, did not produce a single capsule. 



Exp. VII. This long-styled plant was the most fertile of the eight 

 plants of the first lot. During 1865 it was surrounded by illegiti- 

 mate plants of various parentage, many of which were highly fertile, 



