SECT. XXXIX 8. i. GENERATION. 417 



but from any part of the lon caudex gemmae above mentioned, 

 as appears from new buds fpringing out from any part of the 

 bark, when the top of a branch is cut off 



Now if a fcion of a nonpareil apple be ingrafted on a crab 

 flock, and a golden pippin be ingrafted on the nonpareil, what 

 happens ? The caudex of the bud of the golden-pippin confiils 

 of its proper abforbent vefleis, arteries, and veins, till it reaches 

 down to the nonpareil (lock ; and then the continuation of its 

 caudex downwards confitls of veffcls fimilar to thofe of the non- 

 pareil ; and when its caudex defcends dill lower, it confifts of 

 veffels fimilar to thofe of the crab-flock. 



The truth of this is fhewn by two circumflances , firft, be- 

 caufe the lower parts of this compound tree will occafionally put 

 forth buds fimilar to the original (lock. And fecondly, be- 

 caufe in fome ingrafted trees, where a quick-growing fcion 

 has been inferted into a flock of flower growth, as is often feen 

 in old cherry-trees, the upper part of the trunk of the tree has 

 become of almofl double the diameter of the lower part Both 

 which occurences fhew, that the lower part of the trunk of the 

 tree continues to be of the fame kind, though it mii'l have been 

 fo repeatedly covered over with new circles of wood, bark, and 

 cuticle. 



Now as the caudex of each bud, which pafies the whole 

 length of the trunk of the tree, and forms a communication from 

 the upper part of plumula, to the lower part or radicle, mud 

 confift in thefe doubly ingrafted trees of three different kinds of 

 caudexes, refembling thofe of the different flocks or fcions ; we 

 acquire a knowledge of what may be termed a lateral or pater- 

 nal mule, in contradiflindlion to a fexual mule. For as in thefe 

 trees thus combined by ingraftment every bud has the upper 

 part of its caudex that of a golden-pippin, the middle part of it 

 that of a nonpareil, and the lower part of it that of a crab ; if 

 thefe caudexes, which conftitute the filaments of the bark could 

 be feparated intire from the tree with their plumules and radi- 

 cles, they would exhibit fo many lateral or paternal mules, con- 

 fitting of the connected parts of their three parents ; the plu- 

 mula belonging to the upper parent, and the radicle to the low- 

 er one, and the triple caudex to them all. 



A feparation of thefe buds from the parent plant is faid to 

 have been obferved by Mr. Blumenbach, in the conferva font!- 

 nalis, a vegetable which confilts of fmall Ihort flender threads, 

 which grow in our fountains, and fix their roots in the mud. 

 He obferved by magnifying glafles, that the extremities of the 

 threads fwell, and form firuli tubera or heads ; which gradually 

 feparate from the parent threads, attach themfclves to the 



VOL. I. F F f ground. 



