CANALICL'LAK APPARATUS uF ANIMAL CELLS. IQI 



ell-, ritimately by a continuation of this process we ha\c 

 ill'- f.tiuiliar picture ot' the plant cell with a large central vacuole 

 \\hich run -trand- of protoplasm which are the la.-t at- 

 tenuated remain- .f i In- protoplasmic partitions between t lu- 

 ll-. 



A -imilar inn hani-m is revealed by the same technique in 

 the ia|n-ial M-ll- "t Liliitm candid nm. In preparations made 

 alter fixation in I lemming- fluid, the protoplasmic tip of^the 

 t i-ll pre-eni- a t< >am--t ru t urt- o\\ing to the presence in it of a 





J^ 



- 



' otiowinj; the expanded 



..ile. 



e nuinl'( i . >t inn- \.u ii.il.--. In .11-. however, which 



ha\i- !.< 11 madr l>\ the tr. hni(|ii<- to above, it is seen 



thai in-icad <>| a mull il in ! >l minutr \a u.lr- < >r alveola-, there 



-trin . r canal- t'Tiniiii; a network which 



"]>t n- at intt i\al- int.. the large vacuole which ncmpies the base 



..I the . ell. 



Apart Irmn the 1 ineni- \\hich i"ii-tilute the tubes or vac- 



ii"l to the UK tlmtl of preparation, the cytoplasm of 



ihe-e celU -In >\\ - M, . i ndi< at i >n whate\'er of an alveolar struc- 

 uire under the mil r - ' >|M-. It i- composed of an optically 

 homogeneous ui.'iind -ub-ianci- in which are imbedded the mit<>- 



ln>ndria and ciher granular eleiiieni-. t.>r example |)Ia-tid-, 

 \\ hich ma\ I e pre-i-nt. 



The tun ditlereiit ti chiiique-. therefore, jjve u- t \vo entirely 

 dittereni .nceptioii- of" the hi-inry of" the \-aciinle. According 

 to ihe lir-t ihe \a, uole ari-e- from the 't preexi-iin;^ 



innunieral'le -mall \acuoK--. According !> the new method-, 

 the \acuole in the-e cell- con-iitute- a unit elemenl from the 

 verj I'l-^innin^. beini; re|>re-<-uted in the N'oiin^er cell- l.\ a -ii 

 -\ -tern of ana-tomo-ini; canal-. 



