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couple of days the stalk of eut flowers turns yellow at the 

 top and soon dies from above downward. The measurements 

 show that the ovary plays if not a prépondérant, yet a 

 considérable part hère. So the flowers-stalks of flowers 

 which already opened, grew from 28.2.05 to 6.3.05, in two 

 cases from 16 and 14 mm. to 23 and 24 mm.; a flower 

 of which the perianth was removed, in the same time 

 from 17 to 21 mm., while two flower-stalks without their 

 flowers measuring 20 and 14 mm. had reached 22 and 16 

 mm. the next day, but after that died ofF. Cutting the 

 stamens has no great influence on growth; yet growth 

 remains very small if stamens as well as perianth are 

 removed, so that with Galanthus the ovary régulâtes the 

 growth of the flowerstalk to a great extent but not exclu- 

 sively. On the other hand the flower-stalk remains alive 

 as long as the ovary is still présent on its top. 



Exactly the same behaviour in shown by Narcissus Pseudo- 

 Narcissus L., where the stem continues growing when the 

 flower is eut, but the flower-stalk stops growing and dies, 

 if the ovary is wanting. I may add hère that for the 

 growth of the stem it makes no différence whether its 

 top is eut above or below the swelling occurring at the 

 point where the bracts and flower-stalk are implanted, so 

 that this zone also has no importance for the growth of 

 the parts under it. Also stems of Gialanthus and Narcissus, 

 eut in the basai part and hence separated from the bulb, or 

 even parts of them, if they were taken from plants with 

 their flower-buds still closed, continue to grow vigorously 

 whether the flower-bud be présent or not. 



TuUpa Gesneriana L. shows something différent again. 

 Hère the flower is born by a leafed stem; the internodes 

 which are placed near the base stop growing sensibly 

 towards the time that the flower beeomes visible from the 

 outside and is about to open. At this stage, however, the 



