Trilune Extras Lecture and Letter Series. 



base of the brain. We cannot attribute that loss of con- 

 pcio!i.-:;e-- r.i want of circulation, for the blood in .. 

 Circulating thei-i:. Uutthei-' i> another fact. If we jral- 

 vamze tl.e ;ir TH'j-ini so as to arrest tlic heart'; ii.-'ion, 

 tln-rc tli' '.. :- ii" < .reiilati.'ii ;it all in tin- lirain ; an 1 if we 

 Lave j:alvai.;z -ii OM:\ tin- p.rtof t In- nerve which 



to the heart after having divided It, BO that th'-iv i- no 

 circulation at all in the brain, tin- aiiiiniil remains eon- 



i- 18 fOI eiu'at nr t'-!l Si-coll Is. Therefore, A ,H I] we 



find - r!i ;l c r: mi 1! 1 it.itlotl Will produce a 



I 18 Ol con-cl'iil-iy s. Immediately, BT6 c innnt lo.ik il]ioli 



tbe loss of couftclouaoess as being due to 1 itioa ol 



emulation in the brain, as tn.it cessation dnc- not im- 

 mediate!] ' Icra, 



too, tin; hr.ilu l:::a:n- BOtive smie 1 1 me-, although 

 tin re is no circulation in tin- brain, although the 



1 I then ' ; y bl.ieu. It shows that tin- br.iin 



in-iv ri-iii mi .1. me \\ in-ii deprivi d of circulation, and 

 e\m '! 11 \\ --MI. We inil^t tin i-,- Ion- ail nut thai there is 

 Ull active call-'- which produces the Ce.-sa;ion Of the 



activity of tin- bfaln iii those ca-i-s m winch it is pro- 

 duced b\ ih' :i of the nervous system. 



INDIKKl T NT. KYI-: FORCE THIRD LECTUBB. 



CATS!- "I I"-- m i i-N-i I'-rSNESS NO I- IKK IN" 

 TIIK III \I Mill: I'M Al'ITATION ENOHM"! s 



DOSES OJ >i i:vt IINIM: srnDKX RECOVERY KI:I>M 



M:c>i::\i ll l> M. I UAKi.Y VIOLENT REMEDIES lull 



in -i! i.-i.v. 



]!>IIN, Man li .".A larcc audience assemble*! to 

 hear Iii. I: n\\ u-Se.|uanl s tl.iid lecture ou Nerve 



I'lllce. 1 Ir sp.iKe as fu]liiW>: 



J.Ai'ii - \M. i .1 vi M MI N : I tried in my last lecture to 

 ehuw th.it mr\i- now-!- e.ni stop a food many of the 

 ino-t iiiiiiort.ini ari-ihat t.ike plaee in our system. I 

 li i\ e show a that tin- In-art'- action can be stopped sud- 

 denly; that ie-piratmn can a No be stopped suddenly, 

 ami I -ha.l 1 1 \ i" -aow I hit our e"ii-ci on. -ness may also 

 In- lo-t -uddeaiy by an aei Miml.ir to those which arrest 

 circulation and r. --piral n-n. i ialv inizatloii of a certain 

 iiei vi in i hi- Deck. TOO know. Mop-, the hearl's action. 

 As ri-L'.ii-iU i"ir roii-cion-iie-s there are a ureat many 

 ciri-unitiain-1-s in wlneh it may lie lo.-t. Those who are 

 Hit; I he.ilih Know full well that every t went v-fonr 



liour- i ii - v. iii lose conaclousnene t'r a time. IN-I-SUIIS 



Cut of heallli ma\- lo-e eonx loii-m-ss Inaut.itt! \\hirh 

 Ve . Jie ; they Will lose It ill {lilcpS.V, apop e \ . 



nnillni-eii.ini ti. rm- nl asphyxia. In all t he-r ea.ses it 

 }>. jio-s.lile I.i .elmi' I hat tin- lo.HR of Consciousness Is due 

 -nt i rely nr i-hii-ih : o t in- contract ion of tilt- Id.md ve->els 

 In tin- br.iin. 

 I .staled in the la-i leeiimi certain facts In oppoM-i..n 



t" that vii-W. I shall in.t li p'-at these; out Urn- is 

 one Jiolnl nl t:n-at imp.inanee. to be noted. Then- i- 

 ai:eivein the n. i K \shii-hiroesto the blood ves-els of 

 t In- ! rain and ha- the pnwer when It Is excited to pro- 

 dm-r a eonli a.-i ion Hi tho>'- blood vi ^-els, so that circil- 



lai," i'i> d In a i: I ji.irl of the br.iin. Then; is, 



therein! e, a -i "i 1 1 ot; to I In- t heorie- w lneli we liave ud- 



lllltli (I t"l a Ion- I ;me. a e Ml-e here fol - the ei'HSIltioil Ol the 



ueiiviivot i-oii.-i-ioiioi-s,. |;ni i iiai ean-i- Is not the only 

 <u.i at wui I; in tin- li .-Hilling a I 1 i-l n! IO-H of COHSClolls- 



aesx, either In epllppay or apoplexy or sleep or ID the other 



Ht:itCH 111 Wllleil We 1 eiill-elini-Me-- ; ln-e.ill-e In COF- 



t-iin expersirenl- I divided thai nerve (ihe HI mjial he] n-) 

 c that It could not an noi-mally and produce a coutrac- 



';OM of the Idood vessels of the lirain. TllO bndn 

 warily, if the heart continued to be,, it. received tijo Mood; 

 a:nl in .o!"e of those cxperiaieiita not oni;/ mar sympu- 



Ihelle ne; Vi had been divided, 8O that the bloo.l Vessels 

 in the brain were .cor^etl with blood b -cause when that 

 nerve is divided there is more blood in the parts of the 

 nrai'i to which it K >cs but, on the other hand, the nerve 

 of the jiur t'lijniii was also divided, audit' 1 applied a 

 galvanic battery to that part of thu par vagum troinjj to 

 In- heart, and which you know, by tin la-t leetitro. will 

 pniiiuee a eessatiou ot the action of the heart there 

 was. under the.-e eiri'um.-iam-es, a cessation of tho 

 a-tiou of the heart without any trouble in tJio 

 i'i-ain but that due to eessaliou of circulation. In that 

 ease there was a continuation of the activity of tile mind 

 of tile, animal for ei^ht or ton seconds at least. In 

 these cases the circulation, although improved in some 

 pari.-n! tin- brain, ceased altogether after two or throe 

 .seconds, on account of tno cessation of the aciiou of tho 

 In-art, and still there was activity of the braiii. A9 

 noticed in my list lecture, the activity of the brain will 

 persist in certain dlse-i>es i-lndera, for Instance al- 

 ihoii-h there is hardly any circulation in the brain, and 

 the blood is not at all charged with oxygen, but is dark 

 and considerably altered. 



THE PIIKNOHCNA OF ARREST. 



But now, if, havinir matters in tho same way 

 that is, having divided the par vagum so that I can 

 irritate the bnso of tho bruin without stopping the. heart, 

 and the svmpathetic has been divided so that there is 

 plenty of blood in the brain if then, "with a- needle, I 

 ive but a touch to a certain part of the, base of the 

 brain, the poor animal, in some instances, thoujrh not 

 always, immediately ceast>8 to t'-cl and loses conscious- 

 ness completely. He loses consciousness, although cir- 

 culation continues and the brain is full of blooil. Tho 

 loss of consciousness, in that instance at lea-t,isuot 

 due to alack of circulation in tho brain. There mu1 

 be another cause. And that other cause, onb-tantiateii 

 byatrreat many facts which I have not time, to mea 

 tion, is something quite similar in nature to what takes 

 place \vheu the heart is >io]);ii- I in- tir- J.M! vaniz ition of 

 the nerve that goes to the cells of tmv mut'-r within 

 ir. It is the same thing that takes place when, certain 

 parts of ihe nervous system being irritated, respiration 

 stops also. In other words, it is one of those phenomena 

 which have been called inhibitory, or phenomena of 

 arrest. 



It i* important to know that often very slight phe- 

 nomena will act very powerfully. A partition of the 

 muscles of the eye in a person with what is called 

 hypnoii-m is often quite sulli'-ient to chaniri' tliecomU- 

 l ion of the tilings in the state of tile lirain so as to make 

 the person losu conscio'isac.-s. In that case there is a 

 condition hko '.^'it of Sleep, with I his dillcrence, t liar, 

 w li'-n called, tne j.ersotl will act lilcn a somnambulist. 



It has beep _. 11 nest ion whuiln-r t h -re i> life lefi in thn 

 head s 'pa/atcd ironi til. 1 body. Well, t he expei iaienf s 

 that show ""if the irritation of Inc. spinal cord near 

 the nu-rliilln i!i!iniijiitii will produce a loss of conscious- 

 ness independently of the loss of blood, which is ul.-o a 

 cause of loss of conscioilsuc--. 'The ,c e\;i rnuciiM show 

 that the cnll.ingof th.- neck iiiu-t also prmluce a state 

 of unconsciousness. 1'hilint liropl-d s may lliu- feel as- 

 sured th.it per-ons who are decapitat-'d know nolhiu,' 

 Of their f.ite Iminedi itelv al'ier the blo\V. 



si.Kiur- i i ii crs nt-- si.niiir iituiTATinv OF TIII-: xr.HVES. 



I pa.-s now to another kind oi arrest or inhioitory in- 



lluence. This part of my Hiib|eoi oii^ht. to have received 



the full and thorough Investigation which. Its luipor- 



