\AL1CULAR APPARATUS OF ANIMAL CELLS. I Sg 



The de-cription- which follow have lx.-t.-n ilrawn largely from 

 iht- -tudy <>f preparations of the root-tip of the onion, but the 

 r\ation- m.i'li- on the roots of the other genera mentioned 

 an- in lull accord with them. 



In hi- -tiidy of the vacuolar system of tin- cells of plant-. 

 \V : -he young cells of the onion root-tip 



follou-: "In tin- \oimgest cells of roots two or three niillinu 

 in diameti-r I -a\\ a -reat miml>er of ver>- small vaciiole-; the 

 lar^e-t had a diameter of four mikra, the smallest of one mikron." 

 -mall \ai iiole- he claims reproduction by di\i>ion, in 

 the sense of the tonoplast theory of DeYries ('85'. He al-o 

 deri\ e- i In \ at IK .It- i .t t he older cell from these multiple \ arm >le-. 



ice. 



In preparation- made after fixation in Flemming's .-tn>ng tluid, 

 I In maim'- tluid. /.< iikn'- lluid, Carnoy's Huid, etc., and >tain-d 

 in iron h.i-mato\> lin. or in the three-color process of Flemm 



tiding to these were obtaineil, that i- io 

 tin- \oim- cell- contained a multitude of small vaciioK - 

 \\hich l>\ their coalescence seemed to form the large central \ 



Hole of tile i.Mer Cell. 



( }\\ the other hand, preparations made by methods whieh I 

 had found to 1 -I mo ii\e for the demonstration of the canal - 



ieular apparatus in animal cells, gave results which were wholly 

 diltireiii. In the-e iluie \vas no trace in the youngest cells of 



the rout tip <i| the multiple 

 \ at IK .le- de-i ril-ed l'\ \\ -nt and 



other-. l>ul in-lead. < .1. h tell ^> 



^r *MI* X% 

 po--e--ed an imri.aie network * ^L 4 !' * * 



o| canals the .omponeiit ele- . ' 



ment- ot -.\hieh in tin- \oimgcst 



II- \\en- often of extreme fine- 



Fir,. I. Cell of outer \ tin- 



111 " !1 " inals were best root tip of onion showing fin , 



a in the dermato^en cells on in the cytoplasm. X 800. 

 the -urfai-e of the root but were 



i. . o^ni/able a- -ueh, though less well preserve* 1. in the . ell> of the 

 plenum-. I i-. i -lio\\- a cell in which this >\-tem i- romp< 

 of extremelx tine .anal-. In this figure it will be -et-n that the 

 ranalicular -\-tem tend- in the-e cell- a- in the animaljvl 1 



*'* * 



