44 



Tribune Extras Lecture and Letter Scries. 



Indicating on a more correct i>l;ni tin- del'u-aev of ; 

 markings. V,"e tee some iign> here ot nil atm<>-pl' : . 

 which is- -ary to lnV. Tin -re v..u see tin- t wilight 



(mil-. Hi. it more marl; .-il, and you 



tlifi-- i- :i ii 1^-1 ulity of life, ad It depends upon the ex- 



i-tenee of an .l!ni.i*phere. 



Nuw we will pa-> t.i th planet we lire- able to study to 

 Hie lie-t adv. inlay -. our moon, which wo an- so used to 



\ as .1 mi-re .-atellite, lull which Is a planet having 

 I In- -aine pain around tin- sun as we li ive. We an- .-o ae- 



1 Iu i--u' .11 I I he .-.Till as tb.6 Center of the. s.ilar 

 in, that t tli.ii -h,- is a planet like our ow n. 



- a planet circling rein I the sllll, having HearlV tllC 



same patb aa we bave. We win ii"W h.ive a pictur- ni 

 (he moon ! roui.'lit on the .-crecii, showing tlie relai T( 

 size tif tin- earth. Now let tins In- ivim-m "Ted. You 



.der the d.am.-ti r of thin lesser orb, aud It is about 

 the foiir.li p.rt l tae earth. TllO surface Of the 

 (noon i> all nit I Ins thin enth part, but tho Toluuiu 

 dne> n..( ln-ar .> i k r i at a proportion. It is a little uioro than 

 ih tiftii-rii p.irt. If w a--nnie th it the same qiantiry 

 of malt. : . mi character as on tho earth, 



then- win not he tin- s ime amount for each square por- 

 tion. So tli- i.. . ihl h ive boon less relatively. 

 W.- il.iii'i tin I riiniu-u traei-s of atmosphere on tho moon 



.Direst th it theory. In my last lecture I t-poko of 

 tlie ch.iiiue., IP our atmosphere. That :it first 

 lln-rc was chhiriue, sulphuric acid, and car- 

 with some steam. Wo know that 

 tho steam tonne. 1 the oceans. Wo know that 

 ihe chlorine and sulphuric acid were gradually used up 

 in fnrmiu:.' cbemloal combinations aud then, the carbonic 

 old WM w drawn hv tho processes of vegetable 

 urowth. The, c!i lilies show how the atmosphere may 

 In- gr.idualh i laced in amount. I mentioned that it 



iMv li i I great -r density than now. It was wlth- 

 drawn and reilnoe i in <i<i unity, uud it may come to aa 

 ml. There may a lituu come when it will gradually 

 ha\e lie. ii enn mi. .1 in Mime chemical processes, com- 

 bining w ita tin- various earthy substances those th.it 

 form tin- snria i tlie earth. In tho case of the moou 



pr u in iy iiavn been pertormod, aud so in it the 



iien- ha> in-i.-n reduced to its present small 

 mount. 

 7111; M. HIN'S M-i:r\<:E V.VSTLT DIFFERENT FROM THE 



EARTH'S. 



ThN is a pletore of tlio moon in Its first quarter, and 

 you nee it i, e.iveivd wiih IT tiers. Wo flud here much to 

 t'-aeii u- th it v. e are not to think of other worlds from 

 DOT OWD case. Wo see that the moon could never have 

 I throiu'li the stages that we have. It must have 

 unflti-d for tho aoodo of lire. Life would have 

 en.; V. tho continued downfall of meteoric 



matter, mi.-- -iin;,' tho ide.i that tho higher forms of life 

 eunid not, h.ive existed there. There we have 

 the moon ten lln.^ toward tho full, and we 

 rei-ot'inzD ii"i.,iii^- of those thinirs that are rc- 

 (k'iil/ed a.s n. !-,--. iry to life hero, ut any rate 

 to tin- higher fi.rin, of life. Wo see, then, that the moon 

 I thron,'!i i - whou life wiis possible. 



We an- n.it to reu; u d ail th p. n,. 's of the solar system 

 as at present 1)1 .iii.i 1,- of life. We pass from our oart li 

 tu the MI xt In i.rd -r of ill-ta:iee, and wo find el^us that 



tin-re IH no life, ir that analogy be extended, the state- 

 men (may be made that l.fe iiiiin any planet is not ut 



pre-ent exi-lin^', nr the IMIII- Is past or is yet to come. 



There Is mil'-h to ^ho'.v th it the ilni>- lito lasted upon 

 Ihe moon was vrv mii-h shorter than tho time life 

 may la ^t up" 1 1 I h earth. We find, a I ,.., in tin- easp of tho 

 small orbs lhat a email orb radiating Us lieiU into space, 



having a volume not corrosnnn-'In^lv l-jr;:>, p-rt?d with 

 its heat more n-::;'.ily, and I taiuk WL> are ! 1 to the ia 

 fnvnee that the smaller orbs li:te our moon onlv- 

 remalned for a very abort time th^- a'l.iieso! life. The 

 theory "t' Dr. T. S:t-n-v Hunt was that the met. MI s travel- 

 Ing aroiin.l ihe MI:I were, th.' ab.i-t.-s of life. T.ie metals 

 in tho>e im-teors indieate a form.-r eo'i.litioa when 

 vegetable life u:nst have been pres-nr. Then, acrain, ho 

 flnds h.vdro-earli'iii, and, therefore, ho i-onceivf.a th& 

 >trane;i' thought that in the first S|:IL;' of their existence 

 they were covered \\itli vei:- talde growth. 



THE yfK.-TIOX OF Sl'OXTANEOfS GKNEHATION. 



But if we a.-Mime that then the sma'ler orbs must havo 

 eiisH-,1 only tor a short time in fi.a* condition which 

 \\ aa favorable to life upon its surface, this other thought 

 is .-ii^eMed that that v< ^'. -table life must have bt'eu 

 produced siiuntaneously. It seems to me if only Dr. T. 

 Bterry Hunt can establish this view, that \.-.- table lil'o 

 e\i.-'e:l, we, have leaved upi.ii us the iro:i-!n.-,iou that 

 ,-pontaiieons generation is the true law in t !H>SO cases, 

 and the controversy between ]>istiau and Ilnxler ma-[ 

 bi- settled eventually iu favor ot the bclu-vers in 

 spoiitaueous gener atlon. It would alvio-t .-eem as if 

 there \\ere a >ta^c in tho existence of any orb when 

 vital force was present in the crb ir-i li'; an 1 thus spon- 

 taneous veeeiation must have been pi\> lu.'ed. This 

 \\<e.ld enrre-.pon.l to what we kuow about I lie chemi.-a: 

 cleiaents, which immediately after toeing separated 

 from chemical association, pos>e.-, a curious power of 

 affinity by which they tend to proceed duveily toward 

 a higher staire than of the elementary con:!i: i.m, tlie ani- 

 mal condition ; and it would siii:{;cst the possibility that 

 there is yet another sta^e when vei.eta: le matter is 

 ready to pass to tho form of animal life, when sponta- 

 neous (.'cm-ration is possible, lii-fore that il is impossible; 

 afterward it is impossible. At a eeriaiu staye, however, 

 it appears to be possible. 



Kow wo will pass from this picture to another which 

 tends to fchow the cvi lence on which some asiivnomcrs 

 were disposed to In lieve that some ere a in res existed on 

 the moon who possessed the power of making fortii!-- <- 

 lions, and they point to the fact that owniir to ihe small 

 gravitating power of tbe moon it would be possiMo for 

 creatures of tho same size as man to erect much larger 

 buildings, and BO large, Indeed, that tin- si-ns of those 

 buildings might be recognizable from the enormous dis- 

 tance at wln.-h we view tho uioou. But we IMOW that 

 theory is disproved, and we can hardiy coneeiv.'. l,o>v 

 creatures Otherwise corstrueled than we could havo the 

 ivaMining power to build those. 



A1TEARAXCE OF THE MOON'S SURFACE. 



Now we will have a picture illustrating that point. 

 There you have the trreat black shadows which v.e find 

 thrown, there you have tho minor shadows, and there wo 

 1! ml tho evidence, of the U'IM nee of atmosphere, and wo 



reCOiUliZ tlie fact that if there be llihabilai.t- of th> 

 nioon they would have, even at (he time when the sun's 

 rays were poured on the surface of tin moon, a perfectly 

 Hack sk^-. There ymi have a picture showing the moou 

 as her surface probably exists at Ihe present lime, those 



enormous craters indicating the action ami iu>,-. ntall of 

 meteoric masses, and very little to suKge.-t the idea that 

 life at present exists. 



We will have now two pictures brought on in rapid 

 Succession, Illustrating the way In which artists havo 

 endeavored to pic t nre the moon, with euormmis circular 

 craters. .Supp'i-e the ca-o of this crater (pointing it 

 out), remembering I hat It would have 1 a diameter of llvo 

 er MX miles the irrcat crater, C'opernicuH it l- 1 called 

 Jo you not feel that tho outbursting of so small an orb 



