PREFACE. Vll 



29, 32, 37, 47, 66, 77, 82, 86, 100, 103 (i), in, 115, 122, 133, 136, 

 143, 149 and 154 ; by Mr. R. Chislett on 17, 73, 95, 105, 112; 

 and by Mr. T. Baddeley on 153. I am grateful to each of these 

 for their help, and to Miss Turner in particular for special 

 permission to use Plates 21 and 62. 



T. A. COWARD. 



