160 



IOWA ACADEMY OF SCIENCES. 



ft q^ri 

 o 5" 



fc£— H 





si 



£?l| |S2 



® ." £ to 





o o o s 3 o 



ftftft^ :S ft 





-III i^i-^ii 

 sill's >.isil^5 



^ o-;^ « ^ >: 2 a g-^ 2 s 



o o 3 3+? o 5 o o o c 3 

 ft ft.- ftOftftftaftftft 



s:i^.^ ^-h-^ 



^J3.ti 



W ? M ~ 5 



"^■■"ftaS 



K 3 c ' :^ 



2a§.-i 



»J M tn to a; 



o) o ai o oj 



S- t- fc, S, fc, 



o o o c o 

 aaaftft 



%2% 



41 O.-. 



If. Ji li 



(C 01 o 

 1^ t^ ^ 

 o o c 

 ftftft 



•9J0dS 



pezis ran 

 -ip8ai JO 

 m p B 9 J q 



<^>-<}i oos cj>n c 



to jc jc en M CO --D ci ij c 



TTtTTTTT i'" 



:SJ^? 



> O g: -*" 35 m - 



j-^o-^^rO'tj^iccccoc 



_ . _ ; N rc N m « CO N CO 



ococom-^ojoojcomw 

 coco->iicom->*nomco?i-* 



(NX-* 



I Ml I 



lO TT CC to ■<*< 



•9JO(3S (JS9 



-llTjms JO 

 mp'Bajq 

 puB mSaai 



tot- MCOi-H (» 



I I I liJ I I I 



ggsi§s^ 



£ r?^ :o (M CO 5i C2 T-f C J ro .-T c^ w (M CO -* ro :o -X) -* CO 

 M a: cj o; 71 ;-^ to to 



CO N « o cs CO to 



CO Irt CO to -91 ra OJ 



S?5§U?^5§?? 



•aiods 

 !IS9Sjt;i jo 

 q 1 p B 9 jq 

 JpuB q^gaai 



M I M I I I I 



to lO MCOiC COi-Jt- 



5J ci ire M o: to •£-' 53 ire 

 t--*jcm-<*ci5ireco-* 



OJJO -CK t-t- tOt-t-b- -tH (MCO 



u-'N-^to oocicsi-OSr^oioJcRcstosioJto'sJtoO 



i-oicsiM -jiwciN^cocoo«iNNcoinco-a>totoco 



itiii I doU Uj,,u.M 1,^1,1 1 



si ^ 2 -5 CO oi to n t- OS to to to cs or iri t- c: y; to CO 



sotococo M-j-co-i>i0^ir3^coco-*it-oinoto-* 



■^lII'BaoT; 



'_oeSfc.i.aaj;:;D':3j ."-■ 



S^SS:^3 





sill 



S^»3 : :oo 

 » o ;r cj «^ 3 



^Jla£-|l| 



g a .^ S aS K •/: M 



C 03 c3^J 



2i JiisS^a 





a c3 2 : a ffl 



ilillfiililii= 



•3 3 2§-ft.S.25.2a^§l||' 

 aaS«^aaftft»t^cg02 



(i,iiz^<;pHOC!OEi,&:^<J <;<!dSa,<!!<;<!j«5;Dooo^!KOO 



