502 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



The following table gives some results of the author's experiments : 





Date. 



In Light. 



In Darkness. 







Disc 



Ray 



Disc 



Ray 







Fruits. 



Fruits. 



Fruits. 



Fruits. 







Per cent. 



Per cent. 



Per cent. 



Per cent. 





Nov. 14 to 



20 



58 



17 



45 



Dimorphotheca hybrida, seed j 



Dec. 29 









partly freed of pericarp | 



Feb. 26 to 



8l 



84 







April 8 











Ditto wholly freed "of peri- 



Nov. 14 to 



56 



78 







carp . . 



Nov. 24 











Gutierrezia gymnospermoides 



April 9 to 

 May 9 



93 



92 







Heterotheca Lamarckii 



April 9 to 

 Oct. 19 



41 



2 5 







Buphthalmum salicifolium . 



Feb. 19, 1910 

 to Jan. 30, 1911 



46 



^6 





47 



Zinnia elegans 



Jan. 11, 1910 

 to Feb. 4, 1910 



63 



48 and 



45 



62 



47 and 

 58 



Ximenesia encelioides . 



Nov. 26, 1909 

 to Jan. 25, 1910 



6l 



49 



58 



39 



Synedrella nodiflora 



Feb. 1 to 

 Aug. 12 



58 



5i 







Layia elegans 



Nov. 9, 1910 to 

 Jan. 30, 1911 



58 



88 



35 

 74 







L. platyglossa 



>» 



72 



7i 







L. heterotricha 



>> 











Chrysanthemum segetum 



Dec. 30, 1909 



61 



32 



53 



15 



grandiflorum . 



toOct. 19, 1910 











C. coronarium 



April 8 to 

 May 10 



67 



62 



70 



70 



C. frutescens 



Jan. 20, 1910 

 to Jan. 30, 1911 



59 



5 



31 



1 



Hypochoeris glabra 



April 12 

 to May 18 



93 



100 







There are many other results of experiments mentioned in this 

 paper which should prove of considerable value to those who are 

 interested in the propagation of seed. Thus, in many cases, the 

 removal of the pericarps greatly assisted germination, raising the 

 percentage from 17 and 35 per cent, to 52 and 74 per cent, (central 

 and marginal florets) with Dimorphotheca. Also, with Chrysanthemum 

 viscosum, the effect of removal of the pericarp was to raise the per- 

 centage of germination of the marginal florets from 23 per cent, to 

 98 per cent. Thrincia and Geropogon showed similar results. 



Treatment with nitric acid diminished the percentage of germination. 

 In the case of Dimorphotheca pluvialis, 88 per cent, central and 51 

 per cent, marginal germinated in ordinary air, and 99 per cent, and 

 91 per cent, respectively in 100 per cent. Sauerstoff. In other ex- 

 periments, however, with the same plant 100 per cent, germi- 

 nated in ordinary air. An atmosphere of hydrogen diminished the 

 percentage of germination in the same plant. 



A curious result was obtained with seeds of Catananche lutea . 

 In light 64 per cent, of the aerial and 80 per cent, of the subterranean 



