REJUVENESCENCK IN NATURE. 37 



upper sprouts. If the sprouts remain undeveloped, as 

 buds, until the commencement of a new period of vege- 

 tation, they maintain and renew the plant, while the old 

 " stock," in so far as it bears such buds capable of 

 development, does not die away, as is seen in perennial 

 herbs, half- shrubs, and true woody plants, in which less 

 or greater, merely underground or also an above-ground 

 portion of the " stock" is preserved. This gives the pos- 

 sibility for the plant to rise up in new generations from 

 the same stock, year after year, and thus repeatedly to 

 produce flower and fruit. Finally, if such inessential 

 sprouts become detached, whether by dying away of the 

 old "stock," as in the monk's-hood [Aconitum Napellus), 

 the potato, and many bulbous plants ; or, the old " stock" 

 persisting, by a natural solution of the connection with 

 it, as in the young plants springing from the runners of 

 the strawberry, — the sprout becomes a new " stock," and 

 appears as a multiplying sprout, as a natural layer. All 

 these modifications may occur in one and the same plant. 

 Thus the common spurge [Euphorhia Cyparissias), ex- 

 hibits two kinds of enrichment-sprouts above ground, 

 namely, in the euphyllary leaf region, the densely-leaved 

 spreading, mostly barren euphyllary sprouts, which give 

 the characteristic fulness to the euphyllary region of this 

 plant ; in the hysophyllary I'egion, further, the branches 

 of the umbels arising from the circle of hypsophyllary 

 leaves beneath the small terminal capitules, with further 

 bifurcated and scorpioid ramifications of their branches, 

 forming the rich and finely compound infloresence of this 

 plant. Below the ground, in the cataphyllary region, 

 occur in summer numerous small, reddish-white, little 

 buds ; these are the sustaining and renovating sprouts of 

 the plant, arising with a cataphyllary formation, advanced 

 somewhat in development, and destined to shoot up in 

 the next year and renew the " stock." Other little 

 sprouts, finally, not unlike these, are met with here and 

 there on the branches of the root approaching the surface 

 of the earth, where however they assume an independent 



