WITH A CENSUS OF THE AMPHICHEIRALS WITH TWELVE CROSSINGS. 255 
II. Amphicheirals of the Second Order : — - 
(5W) fjgibeldachk [D*] 
(60) fkbiadlelicgj [D®] 
III. Skew Amphicheirals of the Second Order : — 
(61) i g b l j e c a h f d k 
I am indebted to Dr J. R. Conner and Professor Huff of Bryn Mawr College 
for their interest and encouragement ; particularly to Dr Conner for his helpful 
criticisms. I am especially glad to have this opportunity of expressing to Professor 
Scott my sincere gratitude for her valuable help and unfailing encouragement 
during the writing of this dissertation as -well as throughout my graduate course. 
TRANS. ROY. SOC. EDIN., VOL. LII, PART I (NO. 11). 
41 
