LTXNEAN SOCIETY OV LONDON. 



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exposed in eitluT ca.se to hot siuisliiiie, fare tlu; best. Tli(> lii<;lie.st. 

 percentages of gerniinatioiis are yieUleil by iloalers and sinkens on 

 or in water one to four iiiebes deeji. At greater depths tlie per- 

 centages decrease steadily nntil at seven inches or more the seeil- 

 lings ])roduced by sinkers, if any, do not survive ; at nine inches 

 none were procured in my experiments. 





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The round floaters germinate more slow ly, and yield a lower 

 percentage than the tiat lloaters, possibly on account of the 

 greater difficulty of ])lumular irrigation, since in the round the 

 embryo is surrounded on all sides by a thick laver of horny 

 endosperm, whereas in the flat there is hardly any either anteriorly 

 or posteriorly (see text-tigure). The round floaters commonly 



