^^' IX. 



H 



^^1 obf, 



; in the 



erv'iQ, 



cartli 



'^ ^he baf, 



-ernible i 



I 



eof 



theii 



t 



s 



in all 



^ree the 

 refpec 



^i^. Art. 



-<^ 



I all th 



enaorc 



on the lower 



e embrjon 

 ofe fhrubsor 

 e no apparent 

 . jurnum, and 

 fee reted from 

 lot fo forward 

 linent bud, or 



pect to trees 



) 



tes, in \^' 



hich 



I 



not conceive 



; fpring 



J 



:ng 



part 



when 

 fthe 







cau 



dexoft't^-^ 



)ud,itc^" 



cer* 



ii^» 



a 



5 is ^''^ 







g, ro^i" 



atb« 



- \villo^^'^' .„ 



t 



aiiit^ 



a 



Is 2 



<t 



s 



calves 





311 



e5i 





an 



Sect. IX. 2, 4. 



SEEDS, BUDS, BULBS. 



^53 



and the downlefs rabbit, are long before they can leave the nefl which 



the parent has provided for them 



4 



1 



the grow 



_ prefence of the pith or medulla is of great importan 

 th of the new bud, as may be obfervcd by gradually fl 



fhoot of a horfe-chefnut in autum 



the early fy 



diments of the feven feparate ribs of the late parent-leaf 



central pith 



f the bud in its bofo 



feen to arife 



Th c 

 nd the 

 minatc 



th 



pit 



of th 



e 



P 



llioot, where the embryon plumu 



probably fecreted by a gland at the bottom 

 fmds there its firft reception and nourifhmc 



f the parent leaf-ftalk 

 and is (gradually pro 



ded and elongated by the pith, which exift 



as 



th 



bud proceeds, and thus conftitutes the afcending caudex or uterus of 



hich 



fembled by the wires of flrawbei 



d 



the new bud ; v 



other creeping \v.^^v«^.^^, ,, ^ 



new buds, which form the filaments of the bark of trees, are fecreted 



tables : whereas the defcending caudexes of th 



from 



P 



of the old bark in their vicinity 



all 



hich 



probably occur at the fame time by fympathy, as fhewn in Bed. VII 



Tl 



pith thus appears to be the flrft 



mofl effential rudiment of 



the 



Pl 



brain or fpinal marrow, medulla oblon 



which is the fn-fl vifible part of the figure, I believe, of every animal 



\. 



fet 



from the tadpol 



mankind 



In thofe plants which have hollow flemSjthis central cavity, though 

 t filled with the pith or medulla, appears to be lined with it ; 



as 111. 



picris 



d 



pogon 



former the ftem is not only lined with 



the pith, but wherever a new bud is generated on the furamit of the 

 fcending ftem, or in the bofom of a leaf, a membranous diaphragm 



covered with this medullary fubflance. 



divides th 



itv 



d is 



hich divifion thus diftinsuifhes one bud from another ; and in flicing 



o 



away the part of the flem of tragopogon, where the new lateral bud 

 adheres, the medulla or pith in the center of the bud is feen to com- 

 mence near that membrane which lines the ftem, and to pafs through 



the circle of 



> 



and abforbent veflels, which conft 



X 



the 



/ 



y 



