50 



Tribune Lstras Lecture and Letter Scries. 



grr.it point of interest 10 u* is whether there in- 



crr.itr.r -. re.i-iining as we do, eap.ible of appre -lat Illg 

 iri'iind tl;cm, ami recognizing flic nature of 

 Iln- varh'ii- i bangOS wliien I shall have presently In dc- 

 n-ilb.-; fur I shall d--seri in- [,i you the condition of life 

 in tin- \vm 1 I circling arniunl til- C"lorct Mir-. We 

 know thai th'' existence ii f man upon tin- eai "i i- inn li 



shorter tban tbe existence of animal life, md *nu sin>n IT 



than animal a: d \ ' -g table life com!iin>-d. ami s,i v, e in- 

 ten-ifv I In- argmifiit in view of tins fact. 



This picture illustrates the way In which tbe colors of 

 tlii- double star- ;u-i- broiiiriit about. Tlie uppermost 

 picture -h<>\. - tin- lending lines in tho solar spectrum . 

 jtt-l.iw it .n-i- n.i- two >pee'runir> of die doable star. Beta 

 In f'vL'iiu-, a double star having one compoin ni 



range iiml tin- other blue, and this epectrnl 

 an.ily-is sho-.v- why th'--e colors exist, that it 

 is not inherent in the light of those stars, but 

 that their at:n>-p!nT- cuts off certain waves of 

 tin- light, .iml I'-ave, thi' r.--t of certain colors. 



In the third M'-'''nim you see uinnv bands or lines 



\iT the yclio .-. i i or.mgo part, and therefore a great 

 jiart of the \eilw and orange is cut off, and tint blue 

 and vmieT iiL'nt- show ao tbat tbe star sblnes as a blue 

 sr.ir. in others there la a saperabandaoce of orange and 

 yellow, and that -tar shines as an orange star. There is 

 one p'-cuiianty about the double stars in the fact that 

 we very M-id"m - Larger component of two stars 

 showing the blue enii.r. Von see here the central sun Is 



rang'-, ami the two comi>.uiio!i stars are green. That is 

 the star (i.iiiiina, of the constellation Aiidronipda. Then 

 j mi see the ii' \i t ,vo stars, imtii Mue. The third star on 

 tne upper row is one or considerable interest, and is star 

 61 "f the Swan. 



I Hi: OX A IT. \M-.T OF A DOUBLE STAR. 



Now, let ns inquire what must be the nature of the 

 life on \voi id- circling 11 mud one of those double stars. 

 In the tii-t p:.iee, there are many ways in which the 

 worlds circle abonttthem. Suppose, In the case of our 

 own folar sv.-iti-m. that at some distant epoch our solar 

 system ciriM-ie ( | of ,-i sun and Jupiter as a subordinate 

 or sorond -n:i, t'lnwln-r with heat, and forming, with tho 

 Bon. a doable star. Now, if you consider the other oros 

 nf the solar n.vMi'iu divided Into three classes Uranus, 

 Neptune, and Saturn, circling outside both the suns, 

 th' ii Mars, the K.irih, Venus, and Mercury circling 

 urinind the eentnil sun, looked upon as the special 

 family .f tho central sun himself, then a family of 

 world-* rin ling around Jupiter it ia evident how in 

 tho douiilt; Mars throe families may exist. There 

 Is a little, family of the orange tar, another fumllv 

 circling around tho blue star, and yet another circling 

 iirmind lioth tin) Htarc. Tint is to s.iv, circling around 

 the common orn of the stars. Now, according to those 

 varn.ti- conditions, different states would exist. Tbero 

 would be iiil! rent portions of light received by those 



Mai -. 



Again, take tin- j] ln-i ration drawn from Jupiter, bc- 

 r.ni-M- it himp'.H' i .. in liter. Suppose, instead of Jupi- 



t-r t-hining as be does, be ba a oonslderablu amount of 



brlglitncMs as a bl'ii< .itar, whilo the nun is an orange star. 

 Then we Hiiall have illustrated tho state of air.urs in tho 

 world cireling around the or. nitre Mar. mid having the 

 Mm- Htai traveling iiroiind it. Wlion tho earth is mid- 

 M-UV iK-tween the him and this lilun Jupiter, then one 

 half of the earth would tin llltiiiiin.iteil l,v tllO blue star 

 uml the other naif bv tho orange, and there would bo no 

 night. Tin-re would bo a coiiiliiii.il change between 

 oruntjo da\ ami bin- il.iv. siipp ,-ti- the hlue sun to 

 travel onward us Jupiter doiH, tin-re would gradually 



i -.in i,- rln- change that Jupifc-r, after siilninsr 'it his liicrhfst 

 at night, LTadivilly wo ild ',< .i-mni-a funii-.- Mar. Then 

 II ere would be the nr.i:,g .1 . v. an I af IT t !, orange Min 

 Iml set. the blue sun would still remain i:i view. sn I 

 tho orange day would be followed by :i short 

 bine day. Then *,he blue day would per, and thea 

 would be t wiliu'lit of a strange cliir icier, twilight pro- 

 duced by the bhic and nia'.i'.'e. a st-itn of tlimg-i lto- 

 pether different from aiivwecan im igim-. Thentliit 

 change would gradually gn on until tlie. Idne and orange 

 stars would be in the saii.e p irt of tho sKy, and tllLTe 

 would probablv }><> white sunlight. 



Again let us t;ike the II otof - Msonal fh mges. Sun- 

 {inse the d-iy to be ns it is at the eq iin-.x. ciiu.il <lay and 

 ei|iial night, but suppose th^ orange MIH on tin- on side 

 and the blue on tho other. Then according as 

 tho earth was turned over toward the orange 

 or tho blue sun it would be orange Sum- 

 mer and blue Winter, or blue Summer and orange 

 Winter. Tm; two would be strangely combined. Th-Tc 

 might bo a long orange d;iv in the a re lie ri-gmns, and no 

 night. Then as you pas- gradually from the arctic parts 

 toward the equator you would li i.l the' orange day get- 

 ting gradually shorter, though still rcm, lining, 

 and tho blue clay would bo getting l.mger. 

 There Is another possible circumstance. Suppose 

 tbe earth placed in those, circumstances had a com- 

 panion orn like our moon. Then th it moon, instead of 

 showing merely the changes which our moon passes 

 i hrough, would show some peculiarities. At the time 

 when the e.irth was half lit bv the ornige and blue sun?, 

 the same, would bo true, of the moon. It would pass 

 througli its phases, only in.-tea 1 of being white and 

 black the two parts would be orange and blue. Then 

 tlie earth traveling onward would g ;t one-quarter of tho 

 way around, when the quarter ;>f t'lio mo.m would bo 

 orange. There would be an (.ring. 1 and blue hemisphere 

 of the moon, but the hemispheres would overlap, so that 

 the moon's surface would be div.d id luto four parts, as 

 if to divide an orange into four segments, one part 

 orange, the opposite part blue. Where tin* two com- 

 bined it would bo white, and the other portions would 

 be black. 



Thus again the planets, as observed from tho earth, 

 would show wonderful changes in color. At one titno 

 they would he lit up by an orange and again by a bluo 

 MI;:. Then again the 1 indscan: 1 . would bo very strangely 

 colored; to those parts that were concealed from the blue 

 sun, there would be an orange shadow ; to those that 

 were concealed frniu thn orange MIII, there would be a 

 blue shadow, and a blaek shadow would be cast on those 

 parts where the bh-n 1> d light of :,ho orange and tho 

 bi.ie suns was obstructed. These shadows themselves 

 instead of being neutral would bo colored. Wo can 

 hardly conceive of the wond.Ttnlly enhanced beauty of 

 the t-kv at sunset under these, circumstances. Wo 

 rccognizo in these worlds vcrv curious and varied 

 relations, lint \\cmay bo satisfied that precisely filed 

 relations as I have boon speaking ot undoubtedly 

 existed. 



DIFI'-FIiKXT STARS KKCAlIDKD AS SUNS. 



We shall now pass on to Kia Ar_iis a star, which, as you 

 well remember from one of my former lectures, was 

 once of gre.it magnitude, but is now almost invisible. 

 In the var j.sir, it was shining more brightly than any 

 oi her .-tar in t he heavens except the star Slrins ; at tho 

 present time it is barely visible on tho darkest night. 

 Now this picture will passawav an 1 wo shall Introduce 

 you to a new one. You have In tho upper row there, 

 one of those wonderful clusters of stars. You eee bow 



