Show Things to o Think of When Earth Passes Through Tail of 01 Comet Salt SnIt Lake April To got ot all pos pon possible po sible information on tho the effect on thu the earth and its surroundings when it passes through the tali tail of or a comet arrangements nave nac been neon mado for tho the taking of observations May lla 17 n IS 18 and 19 by b weather directors all nil over oval the United States A A letter leller has been received by br A II U director of tho local office from tho ho bureau In Washington asking him to make mako a along along along long list of observations and asking every ever eer ono one who has hM the tho time or the tho desire also to tako take observations Tho Tile letter asks aRks for data about tho the following expected phenomena and for tor reports from people specially versed In subjects such much as those thos Auroras servo serve as Indicators of tho electrical state of o the outer atmosphere avid and as this tills state possibly may be affected by the tho tall of the tile cornet as wo vo pass paes through It auroras should bo be watched for tor at that timo Tho The location color shapo ox tent and other an as well as the tho times of appearance changes and dis disappearance appearance should all be carefully noted Meteoric trails Tho number times of appearance length of duration and directions and lengths of ot visible paths of oC meteors should bo be noted on all nil three nights but eap on the night of OC May Ia 18 13 Bishops ring Tho curious dust halo wan waR soon seon around the tho sun after aCter the eruptions both of and Mont Peleo Poleo and conceivably might also aleo follow tho ho massago IS be of or tho ho earth through the tho tall tail of oC a comet It there therefore therefore fore lore should 1 bo be 1 carefully Jy looked for tor on tho the days das specified and occasional ly 13 I for some somo days thereafter As A the tho light of this ring is rather faint ob observations observatIons of ot it are arc best made when the sun SlID Is hidden behind some steeple st or other ether opaque objects Color of tho the sun lIn and sky Both the general color of oC tho the sky sk and the color of tho time sun nun depend upon the dust and tho time other OtIler contents of ot the th and should be carefully noted on the given dates Twilight phenomena Twilight col cob colors colors ors their distribution and order of oC changes depend depond largely on the dust in inthe inthe i ithe the atmosphere and consequently these are phenomena that need to bo ho observed on the tho days das Indicated Luminous colors Neither th mate material material rial of these clouds nor the tho cause of light Is definitely known They Thc seem acorn to belong be Ions to the very ver high at atmosphere atmosphere acid therefore should ho bo looked for tor at nt night In connection with without without without out transit across the comets tall tail Zodiacal light From work recently done at tho the Lick and at nt the tho Mount Wilson Vilson observatories It seems scorns probable probable able that tho the light is caused by tho reflectIon of solar light from dust jURt In and auld near the he plane ot of the tho tic If so tIO thon then a change might be expected In It at the tho limo timo of the tho comets Cornets near approach of or the tho earth and therefore the tho extent brilliancy and other features f of the light as they the appear at that time should be carefully noted counter glow But little Is known of or the cause causo of oC faint glow seen Jeen In the tho ecliptic at a n point directly opposite to tho the or orI j 1 I r along the time shadow of the earth Pre Presumably It has tin the same truie origin as s the light and consequently may maybo maybe mayho bo ho modified during tho time transit of f the earth across the tall tail taIlor of tho the comet cornet At dL dLan any an aim rate it should be observed on the th nights mentioned and Its brilliancy at those these times compared with that tbt I Ion on nights when there thore certainly IK is no cue r disturbance To locate the lobe at any an hour of oC the th night flight look bolt In the direction where the sun um was waIve tW he hours General phenomena Solar Sol r ami a lunar balos bales and coronas and all other appearances that may seem scorn unusual and worth orth noting |