SECT. II. PHYSICAL PHENOMENA. I 7 



At the end of the sixth day the leaves of 

 plumelet had escaped from the seed, though still 

 contained within the cotyledons, being soft but 

 perceptibly covered with hairs. At the end of the 

 ninth day the plantlet had wholly escaped from its 

 integuments, though the plumelet was still enve- 

 loped in the seminal leaves, yellowish in its ap- 

 pearance, but gradually assuming a tinge of green,, 

 At length its extrication was effected, and the ra- 

 dicle converted into a root, and the rudiments of 

 a stem developed ; and on the twentieth day the 

 plant was complete.* 



In the course of the summer Ledermuller sowed 

 some grains of Rye in a good soil. At the end of 

 an hour the embryo was perceptibly swollen, and a 

 protuberance distinguishable from which the radicle 

 was to issue. At the end of the second hour the 

 radicle was discernible. At the end of twenty- 

 four hours the embryo had escaped from its inte- 

 guments. On the second day the fibres of the 

 root had augmented, but the leaves had not ap- 

 peared. On the fourth day the first leaf (which 

 means, as I should think, the cotyledonous sheath 

 of Gaertner) began to appear above ground; its 

 colour was red. On the fifth day it had grown to 

 the length of an inch, and its colour was now green ; 

 and on the sixth day the second leaf appeared. 



In both of the above cases the first visible effect 

 was the swelling of the seed in consequence of the 

 * Anat. Plant. Pars altera. 



VOL. It. C 



