III! CENTRAL NERVOUS SVSTKM AS A FACTOR 

 IN I Hi: REGENERATION <>F POLYCLAD 



I! KhKI.I.AKIA. 



M. CHILD. 



Someyeai I V. Morgan 1 described a series of experiments 



ninij tl f removal of the cephalic ganglia upon the 



COUl :.iti'n, particularly of tin- anterior re-inn, in the 



( 'aliforniaii poK.l.nl. >nilis. IK-r conclu-ion i- 



lh.it mull Million- . |i.irtirul.irly in tin- piv-rnce 



n|' M--UI- .iiiti-ii'ii- in t ; :i<T.nion incur- .1- rr.ulily 



and as completely in thea!.- . .mjia a- \\ hrn thr\ an- 



At .iliiuii tin- -aim- lime tin- rc-nlt- of ni\ o\\ n i-xprri- 

 incnt - in /.. ptoplc I I' i 'Mini that \\ hen 



h.ili i.t less th. in h.ilt it tin- -nil- ti--m- \\.i- rcin< >\ nl, re- 



generation inii;lit In 1 1| 'It -If .UK I a- r. i piil .1- \\ hen the i;. 



Were iininjiin-il, Imt th.il uhcii niMir th.in hall <>f the 



!Vllln\ ril. -ii.ll \\ ' '>lll\- -s|n\\rr lull l( 



than uhni lh-\ \\ . i , iiiiiiijn: 



I aUn li'timl, h' its nt int'ivi|iiriiily 



appcaiiil in . :i;^lia 1 lu-in-rh r- \\ i i . SO I'.r 



rmilil I"- lU-lt i ininnl. i <>ni|ilt ld\- rrnn >\ cil, and thai tin- aiimunt 

 nl antni'T lu-u ii--in- in all -in i ih. in in tl 



- uhi-M- r\c -p..t- ili,l n, ,t .ippcar, tlimi^h if^ciirratii ui \\as 



never complete. M-. general conclusion from tl .;UT|IIH-IHS 



was that the Cfinr.il in-r\i.u- -\-tt-in in thr-r lOn: : 



funciioii.il -timiiln- t" the ^ri\\ili ( >|" iu-\v ii--nc, incn-ain^ lioth 

 tlu- r.ipiiliu ami the amount ,,f growth. 



The al'o\i- nii-ntionfil -\pi-riin-in - of I.. V. Mm-. m seem to 



1 V. Morgan. "Incomplel . imi in Hi- A .1 "tin; 



in / '' ii. I \ "5. 



"V. -Tin- Rfl.uion !i''t\vi-<-ii ' 



itinii," Jiuirn. I 



on !< \ I. -Tin' Kt-laiiciii. etc.: Anterior 



ami I. atria! l< .nun," ./ , I., 4. i 



i liilil. "Stin In- on Ki i^ulati.in. \'L." I i,;. ]>. $22, l-'i-^-. \\ i ;, p. 526. 



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