{ 500 ) 



lh(> cciili-al-cN liiidcr iipw .ii'ds, also iii lliosc cases in which up till 

 iu\\\ Ihc ('H'oi-ls had not Ix'cJi successful, j)ei'haj»s on accouul of llie 

 •ireat niiniher ol' cells. 



The invest i<>atiou of Mr. ScnoiTK was an accurale coin|)ai'alivo 

 sliuh of' coiHKMMed series ol' cross and lenulhw ise sections. It would 

 lead nie too far il' I were to speak of this more in particulars. l>ut 

 in g'eneral the in\('sti,üation was conducted in such a w a v that an 

 attempt was made to |)nrsue in the direction of the «irowing ])oiiU 

 the honndarv between tlie series of cells which coid<l he dislingnisliod 

 as endoilermis ajid central-cylinder iji the older j)arls. The i-esnil.s 

 \\"ere in short as follows. 



Of the i-oot of UijiichitJiiis Driciifdlis and Lhnini iisitiitissiiinini the 

 series of cells of the endodermis and the outer layer of ihe cenlral- 

 c\ lindei' (pericy(de) w («re successfully and uninlerrnplcdly pursued u[» 

 to the urow in,L!-point. In these cases a cylinder of tissue could lie 

 distiimuished in the top. w hicli could (piite naturally he compared to 

 the ])lerome ol' IIansti'.in and ^\ Inch corresponded (wactly to the latei* 

 cejiiral-cylinder. Also in I li'linntlins niiiniiis in the» maiji the sann; 

 was found. thouLih the plei-(»me did not appeal' here as a complex 

 of cells closed at the top. In the stem of ////y/^///'//,s- rKhjaris. one of 

 the fe\\ stems in which different iin'esliu'ators ha\ c distintiuished a 

 plerome. this was ]iot only successfully foinid hack, hut also the series 

 of cells of endo<lermis and jxM'icycle could lie |iursne(l nnintei'rup- 

 ledl\ lo llie urow inu-point. IIow(wer the cells of the |ilerome |iro\('d 

 lo form not oidy tlu^ central-cylinder liut also the end<jderinis and 

 lw(i layers of cells of the cortex, so that the re(pnred correspoji- 

 deiice did not exist here. In the stem of FJiuliui (■(iiiddciisis an n]i- 

 cerlaiu result was olitaiued, as hei-e a starch-sheath and a liundle- 

 shealh were f'oimd, and it was not possilile lo make out which of 

 the two intisi lie re,u'arde<| as endodermis. Ihit iji the root of /'Vv^/vr^ 

 I'liiiiniciihiiili's and in the stalks of Arsc/t/ns Hiiiixx'tishiinini. Li/st- 

 nniclnd I'^^iiliciiici'ii m , I'j'oin/imis <'ii iuijkiciis and A//ii/(/ ri'/it'd/s aji im- 

 portant ne,uati\'e re>idt was olitained. Here it was perfectly e\ident 

 diat the series <if cells of endodermis and pericycle cannot lie 

 pursued up to the top. Iiul that they \ery soon stop short and are 

 replaced hy shorter series of cells no! exactly in their prolonualion 

 and w hich in theii- lin"]i soon unrler,Li"<i the same f'al(\ In oth(M- wdrds 

 in all these cases the expectation was not oidy disajipointed ihat in 

 this Wi'.y in difficult cases a plerome was to lie found, hut il was 

 also ii-refntalily eslalilished llial il does not exist here. 



Aftei' the alioNc-mentioned explanations il need not lie demonstrated 

 that these results as a whole must be regarded as fatal to the Theorr 



