170 NATURAL HISTORY OF PLANTS. 



which differ from the rest of the parenchyma in their much greater 

 consistency, may be isolated from it simply by the pressure of the 

 covering glass of the slide, which disengages without crushing them.' 



" It is impossible to avoid considering these scattered cells, as of 

 the same nature with those which form septa in the pith of the ^fa^- 

 noliea. Thus the whole order is characterized by the identity of 

 the structure of these utricles, while their different modes of arrange- 

 ment serve to distinguish the tribes : stony rrl/.s, disseminated in 

 Svhizandrccn and lll/ifcrca, collected into diaphragms in Magnoiwa. 

 In the rapidly-developed shoots of some Ma/j/iolins we have seen 

 these septa reduced to a single stofiy eel/, nearly central, on which all 

 the surrounding cells of the ordinary parenchyma abut by one end, 

 bent, or drawn out in a quite peculiar fashion. 



"Moreover, the sarmentose stems of the Schizandrca are dis- 

 tinguished from those of the Winterea by another anatomical cha- 

 racter. Towards the outside of the fibrovascular zone, they present 

 wide vertical tubular cavities, lined with a fine membrane and 

 riddled with very minute perforations ; very often becoming detached 

 from the walls of these cavities in long cylinders which at once 

 collapse." 



The bark of certain Maynollacece presents peculiarities of structure 

 often related to the use made of this part of the stem in several 

 species we shall enumerate below." Several years ago GcEPPERr 

 pointed out in the bark of Drinti/s Winfrri certain small granula- 

 tions visible even to the naked eye, and remarkable for their con- 

 sistency. They consist of stong celh, dotted, perforated, and often 

 areolate, which correspond pretty closely in structure with the better 

 developed ones which we have described in the medullary paren- 

 chyma.* When adult, their contents are nearly colourless, or more 



uhnulutiiig a thick coat of polylicdral starch- pared by Oliver {op. cit., 3) to tliat observe*! 



grannlcH. I?iit these bodies, uiiattneked by in the stem of certain HamamrHihiir<t ; tliat 



water, arc not dyed blue by tincture of iodine. is — that in the interval between two fibrt>«i, we 



In the pericurjt of M. Yulitn Dksf., MiM>Aiii)KT find very large lenticular cavities, whose ci-ntrw 



ban recently ascertained that the cellu of the abut on the openings of perforations in the walls 



pericarp cont4iin in the thickness of their walls, ofeaclMibre. Here again we have the wimo fact 



" a nml network of canaliculi ramifying in every as in JJrImt/s and the (."onifers. 



direction," of wiiich sonu- cont;i'n crystals, and ' Such are the foUowin;; annnatic bark« : 



the presence of wliich would be an argument in Winter bark, Canellaalba hark, and those of 



favour of the tiiickening of these cellular walls by CiinnimodciKintn, the I'ldip-lree, and several 



internal dejKJiiit (Ann. .SV-. \iil., ser. 5, vi. ;»0!l). Miii/iiulitis used in nieilieine. 



' (iitlKFlTii (A'o/i//., iv. 7lo) has remarked in * /.<«•. (•»/.— ElCill.KK, lor. cit., IHS, t. 32. 



the |)arenchyuia of Kadsura, a htructure com- * Seep. 169. Heretheir variouHdininelers arc 



