X 



4 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 128 



The reader will note from figure i that the ranges of the periodic 

 terms in St. Louis precipitation vary from 5 to 25 percent of normal 

 precipitation, and the precipitation itself varies through a range of 



n -10 



+7 



'j^ *IX 'Zt '20 -i -If *it -II 12) " ' 



4 IS -33 -33 -36 -3t -77 'St +'%; 



-30 -i -26-/8 '%b -59 'IJ>J*Z\ -. 

 Apr *H -2. -j3*«--/8 O -5X*/ir+<<» ... 



+V */V .10 ♦If -9 ♦'^'/ - 6 -/y +V^ -»-3i y-iq 



»ll -rjfc -31 +13. -tS -f^J ■nS^-'fl -IS' l%('*15 

 Jul 413 *!'* '1' -'« -"f -""^ ^f' -'^ -/'/ ^30 +25 



-30 .fit +"5 -5«tW + 7-f/(i-i<J-v7 -/' +t/ _... , 



-« -33 ■t.^9 -^6 -t -30 +3x-iy-w-3; 4i'^-t e-taff-^jitX?^ 

 Oct -l/V -4 +V« -/« +3 - J3 -»7-/fc +1-86 - 2 ' 

 -30 - X **'3 -»J-1+V6 +*¥ */j-»57 +/3 -/V -Vt 

 4.4 -i* .^#4 ^X7+W HI 4-^' ■h'*0 4$l +7 



«60 

 /60 





11+6 .j;i-»78 ; 

 11 +3S't4--t8i 



uiyi. +•» - "^ T*'"' ^A/+5^ -rei +T tt t^i ti -JTfl 



•jar, +'i -^ -'? +32-/«/+/fl8 +/)/ +/5 HI -tSl -5i> 



"" +n_ +14 -10 - (« -3V +7 431-1'/ +1S-»-li ~C0 



fi-i 426 -3^ -3« -2fe -30- 17 - 'il -/r+30 -/£> 

 Aft "lO'ii -%h-3<>-\i '33 -II -)i -fS iib'-i-ff 



+•/ -M"/ -13 ./8 +gV -77 -^2.-^9 '33 428' *tf? 



^.^ rtfe -Z.0 +rz. -/^ -^8-IOH -IT - /¥ 'Jf^tl 

 Jul *it- -33 -S'- *« -J*/ O - ^*--/4 - ''Z 'T*'"^' 

 '^ tli -tf- .iA+^%.ib*loe -i +57 -io-:3i+yi: 



.30 -2. ■f'43-l^ -IS +7 +/S- •/■■« +2 -^ -tUt 

 Oct-V -t -fV? -38 -^ -Ji'+H+Z/ +/3 "' 



+13 -2 +V3 -34 +3 - ra *//Lits-*#*rri^''-i 



/r77 -3'' ■»•''' *'^'' -'* +'' 



J«»»4V +W -/3 tn .l«*. . 



^/i-3^ -A3 +17 -V 0\JI -l« -/S^+3(? -5^6 

 il%.-1i ■Si.-H'^-i^.Mi)! 'Slr*iA,^Mij{,S -(,0 



Afr *(3 -33 -16 -)« -le ■♦%<•» -Ai(^-)f7T^ 

 ' -JO -¥ -,'3 -SS' -q -f/Jft -si-'-^-^^i 



■tZS. 



tH -a -QL0-J6 +3 +7 +/5" +57 +^"1 -?*♦•»«.>< 

 Ji/l +« -fW Oi-i^+fS -30 -t-^i +Vd +^f -H +2^^ 



+12+14 -26+/a-»8*>-3^J+jM v2( +VJ'-3/ -^iJ'i'o _. 

 + 13 -t/ +V3+1? -7 -77+3i-+f2 -;5--e6 +J<}!ti3 ^r/^" 



Oci -30 -r +<tf +32*3 -.jT» -/7 +/r -v» -y-f +•<( 

 -<? +(¥ +#3 -;» <•«. -;i -M -33 +7 +jf/ 



/«7g ■*-;3 ■Hi41i -Jff*i'* -H"* 'J3.-HI -H *3I -i 



jAn -30 -33 -)3 -56 -/V ^J7 -J*- -'8 -"^ •>-'■<> -''* 



+ »^ -33-Z<' -'ff -3t-77 -6 -zf -10 +30 -J-a 



Af +11- -X-Ofe 41^-19 O -II -16 4 '3 *Z'i-iO 

 +|3 +J'/-/3 +32+33 +'»y-S'l 4^7 +i-/ 0-/0 



-30+26,-20 -/t +f«/+6;-;#/+vo+<f -/i+(? 



Jt/L +</ +-/'/ -31- - 39-/0 + las' -Jl ♦2/+ijS- -31+4-1- 

 rH +»<,-26 -36 -3V +7 - 6 - /V -/S" - f6+.4?. 

 + 11 -33 *V3 -IV-Z* -30 +/J'-W/ .•/ft'-/'/.- -- 



0«* +/3 -W+f»+5Z-l« -J3+?/-(r-33 .^7 + 

 -30 -1+43 ♦«-»/- V +/)) -21 -/W +3/ ■ 



U7'? -' •'y-*"'? <-31 +3 +l/«+3t-/J" -V7 / 



Jftn 4'!. -l -P -[9 +/6 *<il -'7 "{f '2* ^f^-"^ 



ny -yo 



+ V +-/V -/3 +Sl-/« -^S^' " 

 f/t + jt-io +xf -f -17-*.* 

 Jul y-/ J - 3J - 32- +32- +3 -« +7r 

 -•JO -H -16 -/«4/6 O 



^i3 -* +^ *3?'+»^-*^<'V -f/d 

 Oct -30 -i/4v? -Jd -f +</ *3l -/.T . 

 ♦ f -X4-f3 -iei-3 tiv - n -16 -'n 



■yj. Hfi^l -hfX H6. +7 ^/J" +5-3J *J0 ♦ 



V/ -^1 'ifS-<f3 -HS ^Ig *H$ -U -SO ■tfi+70-2OS76 



17-8 -61-103 -39 ♦6'? +<?*-!» -•*>( 4HS+ff-32H 73 



6-76-56 -30 ■»-«0+«iO-)7 -JO +Vr+6r-?-4 »6 



" " IfiMHi^-tl -S ■iS0461-*3»Sni 



' .««j»3 +//r.xf 4S -f^+io+yii '<■<> 



.♦*9f +/00-2Sr 430 4SS46ifHf6IH4 



'^^Nl,<^3.-2l +v<» ^57+57+6'<i ilj 



.^^^- .- ?7'? +66-31 +j7 460*S%4iCSHI 



-S3 +/<f ^aH^Sl ■ \.-i0 4S0 ■IS^-'il. 4-Si. 46Z*''t +263 /lO 

 -f2.+3V 433+'>T-j79«y,.<^ ^-^^-S/ +fr .*63-»W+*?2-lfl> 

 -6X+V1 -w? -^/e -/fi +^*ai^-3o +38 +W+''2+67V /63 

 -HUlo^i-i>4 433 +to^iJi,^Si'>-Z'i tSO 4iS 4394693 173 

 - n 4-9S -t-Tt-fi^il^fT^ 4-17-19 41.1 +4l+?t+^tf7'!*» 

 -^Z-/^J^jf/ +V&'^6 +^ -25 4(9 +66+3a+)45'/3(? 



Ti^-ii^'^ fV4 430-»l -I -21 +V0 4(S'5 t^O 'Tfta 

 •S-JS-^ 4f0 +7 -ffO -/* -rt +/0 +Jf +J^+32(«-» 

 3 -y v;. •«8»*.AJa<i3 -s^ 'i%~l^ ^to i-S^4-2S-IS'i lil 



^yir-fo+zi+ir-^^**!^ -30,(0 .tin +57+22. -i7« /5^y 

 .■M/ -Si- -3 ±N-3a.^l> -1' -6 +/5' fso.42o->-2e isri. 



,jj— ff-siTf^r -1/ -r(?-r -420 i-'ib+i'J -l7¥ 132. 



n5 -zH-si*-3b -!>7 -^3 +■!-- +it +3«r+/r- 87 "Jo 



1-53 +'/V-lf-?f-JJ -« -61+7 .410 433 4-10^ IZO 92. 



. +3/ -«'(J-fZ-<*l -I/5--V3 -¥0 -<?« -f^+(». -W +20+r-''22 «*•/ 



-¥/ +vr +»6 -5(3 - 12.-86 -<5 / -f£ - '/A ,f^ -a 4J7 -Jo *n +7 - 5«8 yo 



■~ '■' "- "■ -m-lHi.76 -?3 ..^1 ^.^l| -73+x/ -/li'^ +7 +'+-.63'} SS 



■ 17 .^t} -fo-io^-eo *30 -77+13 -IW ■(■2. 0. 6i7 67 



" il -37 -Ji -Si • IX -78 +56 -ffo -6 -3 . 4^5/ f » 



« -2^-Y -51. -5« -75+vr-*/ -/7 -S~2isio$ 



•4Vf 



+ 6 +¥ +f -50 -tyt -7/ +-^6 -^0 -27 -«■ + «/8 '«^ 

 — - 4JI -50 ~30-i7 4H7 -r -ai-lG +I5Z III 



-IS- -zo.&c4-'/7 i-r -31 -13-^310 133 

 3 i-s^ -3» ■>■ i -jd 4(7 430 -hS" -It 41 en III 



tSO +iBiA.,fH.+72- -30 +5=i -'/0+V6 +'<'? -'<6 -ii + /i7 /27 



f*e +«2>((p»5'? -/r +z« -^O+Vi^ +5^-*<7-2i-+23? /IV 



•1/ -»/»5i£!7Vj^3. -3 +7»-2l4'f/ +57 -H"? -27 +-394 '47 



-*^r#«'^'Tf*C+/» +/S' +6f -;3+37 -f/* -y-i-Zd 4-HS- tls 



'is t5V 4^V>iJU +304*0 0+31 *HS--3t-«»_ I ;jt 



-5>«*Vl-+38'-3*a»M7 4SV 420til +3« ""i't -30 + /«» /V7 



+ /3 +/V-1V -3« -N *ice ■ 

 • 30 416-31 -36 -3V +7^4 

 An* 4" -JJ-»6 -f9 -26^Ja-/fl 

 r ^u ^,^./y +si-/« -Jl-J 



i/+r/ 



+^f -;/ -60 



»•/ ♦vr -3/ -;o 



/r -»6+(f 



f/r 



;33 4-7 +1 



5>«fici.+38'-3"V^.. -.. 

 -f4.+7*9»»ai 43<^6r4?3 4»,f-4/7 4J0 -fcl- -3» + /»» /37 



-tl+P^f+Zi."^ --. _ _^ 



-m 4ii 



0+1<f ^tf64ll 4U -6r-3 5 ♦flS'/'/b 



»o+/M ■•-;«) +"3 -f/^-^* '39*^3^139 



+')iv<?7 4/3^+3 +'0 -7<5 -414177 113 



+J-r + go479 +1/5-3 4/0 -7» -Vi--3V (»6 



■Wl -«? + ;V +£3+80 +/03'-^ +/0 -7/ -V7 - /36 loF 



<»0 -Wr-a7 +V6 + VV 4^3-/* 4/0 -70 -10 4-101 lOi 



_ -«-6/-Jv +3o+3r+7»-/> +/r-6r-r/+w ^6 

 +50 - » -76 -Tf + 7 4-21 +66 -/7 +20 -/6 -52. -;y ft 

 4 'I'i' 4 6 - ^0 -f3 - /3 +'' -^iV -2/ +J!a. -5? -J3 - ;.ry 7J 

 -(I ■»33' -55-^6 -2o-C6+"<"/.lS' 4/0 .Sb-SH-l6V 75*- 

 -»^ +1» -3*? -93 -30-8V 43'^-nS -If -So -SS .ie3 32. 



fp+/^v-ii-/tf3 -ar-yo^tr- 3/ -to -v6-55-6or,JV 



-33+6 +V •564 3f -»3 +/7-3i-//r -uo-Sl-S-eO Sv 

 -fZ43S 4/Z. -II ' -fa -76 4? -31,-/3a. -35-5»-<f75 6/ 

 -(fz.fi«f425"t? -<<6-5-« -; -32 -ffo -30-ST^tS-ST 



■*V9«««W^3 -V/ +/9 4J3 43I -Vf -")( -10 -3f -V+ -i3-jr-3Jj 37 



- CRff J^ 44^ 47> -50 -n -2.X-30 -3« -<7 -5r4-i<jx*? 



*i4+ift. +<» .««'-5/ -»3 -30 -M -f -/*-5r+./4^o 

 E#*/«r+77 +7»-n. -94 «■'<(. Z» -i-S^ -.r-57+/»5 4f 

 '**'»5>»'< ♦5«f -50 -<?>< -30 -!$■ 430 ■tLS0 4^iitll 



Fig. I. — Facsimile of computation of St. Louis precipitation, 1875-1879, compared 

 with the observed precipitation as percentage of normal. Data from monthly mean 

 precipitation smoothed by 5-month running means. Dotted curve from summation of 

 22 regular periodicities, determined as averages over the 84-year epoch, 1854-1939. Full 

 curve, the event. 



over 130 percent of normal. Yet all the work, as stated above, rests 

 on smoothed 5-month running means, which, of course, greatly di- 

 minishes the range from that of observed monthly mean values. 

 The correlation coefficient over these 5 years, between synthesis 



