360 ELEMENTARY ORGANS. CHAP. III. 



And leaf, They are discoverable also in the leaf, though 

 not quite so easily detected as in the leaf-stalk. 

 But if a leaf is taken and gently torn asunder in 

 a transverse direction, fragments of the spiral tubes 

 will be seen projecting from the torn edges, and 

 generally accompanying the nerves. 



But rarely They are also to be found both in the calyx and 

 iy^ancT" corolla, but not so generally as in the leaf, on 

 corolla, which account some botanists have decided rather 

 too hastily with regard to their non-existence in 

 these parts of the flower. Mirbel says no tracheae 

 are to be found in the calyx nor in the corolla, 

 except in the claw.* But I have found them most 

 unequivocally in the calyx of Scabiosa arvensis ; 

 and also in the expansion of the corolla of the 

 same plant, as also in the calyx, both common and 

 proper, of Dipsacus sylvestris ; and in the corolla 

 of the Honey-suckle, in which they appeared to be 

 placed within the nerves, or at least to be closely 

 united to them. 



And other In the other parts they do not seem to occur 

 flow S er, f thC frequently, or at least it is difficult to detect them. 

 Malpighi represents them indeed as occurring in 

 the stamens,-}- but I have not been fortunate enough 

 to meet with them in the stamens of any flower I 

 have hitherto examined. I have looked for them 



* Trait. d'Anat. et de Phys. Veg. vol. ii. p. 1$. 

 t Staminum corpus et appensa capsula ligneis fistulis et tra* 

 clieis integrantur. Anat. Plant, p. 49. 



