NATURAL CONTROL IN VARIOUS CLASSES OF FORMS. 



27 





? O 



bc-^ 



8g cs « 



■S^SSS 



> C"3 



-1 = 



CO CM i.o o -* o O O tO co O l 



-JF CO BrtHNrtrtM' 



!()« t~- CO i— < © t^ 



oss5 io co co to co 



OlOOCOr-o-tcOt^COCO 

 Vrt'i'lM © CO © 



^ ~ o3 $p 

 <p +j ^i bD 



*Zr„ 



Tfl OS HCfflCli-MCgfflHHOCjHH 



O "* O © © O i-O i-O CO O i-O T lO 00 



OCOri-^^TlijrJ^codcNOdoi 



"*noiooiiooxooo'* 



) CO i 

 ICI CN 





CJ-£-^ bC 



pin pi o a 



CU+J+i 



Jssp 



-"C lO 

 OS "* 



iOOH»iOHN00»OO"0i0' 

 rHOOCN^THCCNNCNOdl'W! 



o^-^N^N^NcoooNOiO 



iON00OHOHOOOn«5(M 



1 1-< NOHHMNONOOONNW 



I CM i-Hi-H CO i-H 





CM t- CO •* 00 lO CM ■<*< &0 O t- O CO lO CO 00 CM 

 i-Hr- 1 CM'* LOCOCM ^H CM TP ,-H © CJS 



t^00 -*CN(NMiOcO 



f~ CO lOOO!n«N01>OSOHO!N(N 

 ■f © CO-^CM-^lOCO ,-1 tji i-H lO CM t- 



I CM O0 T 00 tr^ ^H 



THMOlNOOifOCli 



i© Hoofoomoooiooioo 



>iO OiONOWVNtHH- i CM CO ^H CO 

 ■ CM OSCMCMOiOCMi— lCM>OCOi-ICOC0© 



^ CM CM CM OS CM t- © 





CM CO © lO © 



© lO © I 





bo bo bo txi be to be bo be bo bo bo ti 



3333:r~333333C-'- 



£p 





•25,S SoooOOSSOPh^HEH; 



2 * 



o a> 





»i-H NHOI 



Sic St* - - - 5 



i-H CO CI CI 



•3 Hiaaoooa 

 e • y co — © © 



to -r — ci co 



00 lO ©.-.©CM ©CO 



CM© ©^©oococs 



t- co x ci i- 06 _r. i_- 



"C 00 r^-^coco©© 

 oo id tm ci t^ r~ co t^ 



■^ CM CI CI iH CI CI 



.-liO CM i-i CCi 



eooo © © © tp ,-< oo 

 © o © id © to © cd 



CM CI CI CI CI — r-< 



© iC -<r CI © oo © 

 lO CM CI CI (— 



Sig 



© © © co ^h ©cm i 



co t— co cm -tr c co i co 



i— i © rH <N CO H C» CO 



IC t~- CM t^ © r^ © © 



iC CO l~ i.O — i-O I - Cl 



co co © ci re ci tt r: 

 ■«r oo ci -h os ci co © 







CO 







I-" 1 







^ 







CH 



8 





oo 









i— 1 *T CO 







c 



CI c 



iSrii 



be br. bo bo bo bo bo bo 



33 3 = = r = 3 



2 



Sec 

 ■1,5,3 v' 



■- SS all 



3 x 



Q & 



•J H 



33 • 



c : 





