REJUVENESCENCE IN NATURE. 35 



Plantago major and Impatiens Balsamina owe their 

 very different habit, in like manner, principally to the 

 different relative dimensions. In both, i is a euphyllary 

 sprout ; in both the ii, hypsophyllary leaf bearing sprouts 

 (the axes of the inflorescences), arise from the axils of 

 the euphyllary leaves ; from the axils of the hypsophyllary 

 leaves (bracts), finally, iii, the flowers ; but i is a short 

 stock in Plantago, forming a rosette upon the ground. 

 In Impatiens it is a very much elongated sprout ; ii, on 

 the contrary, is a sprout in Plantago, especially elongated 

 in the lowest part, and thereby forming the shaft, or 

 rachis, as it is called. In Impatiens, on the contrary, it 

 is an extremely short stalk, thus hidden in the axil of 

 the leaf; iii, the flower, is sessile in Plantago, and fur- 

 nished with a long stalk in Impatiens. In ii is to be 

 added the distinction in reference to the abundance in 

 which the formation occurs, for in Plantago a great 

 number of hypsophyllary leaves exist, laying the founda- 

 tion of a rich spike ; while in Impatiens there are but few 

 hypsophyllary leaves, which is the cause of the poverty of 

 blossom in the small axillary cyme. 



The complementary relations of the sprouts become 

 still more manifold through the superaddition of a division 

 of a generation, to the consecutive series of generations, 

 which can start from any generation contained in the 

 vegetable " stock," but in many cases appears even in 

 the first generation, produced by sexual propagation, and 

 then gives rise to the existence of two different comple- 

 mentary " stocks." The latter is the case in all dioacious 

 plants, the former in the monoecious, unless the case 

 occurs of the terminal structures distributed to the two 

 kinds of flowers being attained by a simple series of 

 generations. Cases of moncecia through division of gene- 

 ration, so that one part of the sprouts belonging to the 

 same generation terminates (immediately, or even in the 

 second or third line) with male flowers, another portion 

 with female flowers, occur in Pachysandra, Arum, Sil- 

 phium, Calendula, and Eriocanlon, in which the flowers 



