1908.] 



NATURAL SCIENCES OF PHILADELPHIA. 



155 



OCC05C0O ClOTjto rt<tH> CO^ O CO 

 (N (M CO (N ,-H T-4 



^ ^ tj >, i; ^' >> >> tH* >» t-' >^ >>>> b b 





(M T-( t-H CO 



(N 





s s 









c; C! C3 CL 





t^iMOCOl:^ OCOCO 



o3o3clo3q, c3c3o3cl c3Ci.33 c3o3 e3 c3 



Ci< o3 o3 p, 



2 8< 





c3 03 Q, rt Q, 



03 03 03 03 c3 a, o3 



>■. t: >. t*. >> 



SS 



1^ S 



CL 03 Q< 03 CL 





§< 





^ ^ 



S § 



05 l-(OI>! 



tJ b b b ^^ 



Cu ^ c3 ^ CU 





C303C1< c3ji,c3 c3o3 



s :s 





>> >^ fcj tH tH 



ra 03 Qj CL Qj 



o3o3^Cl irfQ^oS w^ 



<| <; -< <i^ <i1 <C<il<l<rj 



^1^ 



tl 





>> tJ t<' 53 t. t, ^h' (H tj' 



^ ftft =3 aftftftft 



f^sl^ 



