SECT. II. TUBES. 301 



also in the style of many flowers, and found them 

 in that of the Honey-suckle only. 



According to the observations of Grew and Mai- And seed, 

 pighi, they are to be met with both in fruits and 

 seeds ; though Hedwig says they are not to be seen 

 in the cotyledons, except during the process of ger- 

 mination, and that only by means of their being 

 moistened with some coloured infusion. But 

 Gaertner says they are conspicuous in the thinner 

 cotyledons even before germination takes place ; 

 and Reichel is said to have detected them even in 

 the plumelet and radicle.* 



But in whatever part of the plant they are found They are 

 to exist, they are always endowed with a consi- e 

 derable degree of elasticity, as has been already 

 noticed. For though they are forcibly extended 

 so as wholly to undo the spires, they will again 

 contract and resume their former figure when the 

 extending cause is withdrawn, and if they are even 

 stretched till they break, the fragments will again 

 coil themselves up as before. It has been said And ca- 

 however, that those of the Butomus ttmbellatus 9 ^lu^ 

 if once uncoiled, will contract again no more.-f- colled * 

 But this is true only when they are stretched to a 

 greath length. For when they are stretched gently 

 and moderately they will again contract, as I have 

 proved by experiment. 



Malpighi, in the course of some observations on 

 the spiral tubes during the winter season, fancied 



* Scncbier Phys. Veg. i. 1 10. t Mirbel Anat, Veg. i. 68. 



