The inner aspect of the skull and the same seen on transillumination 137 51. To illustrate compression of the brain as produced by an extra-dural hæmorrhage from the middle meningeal artery 141 52 A and B. The operative treatment of middle meningeal hæmorrhage 144, 145 53. A basic fracture with laceration of both carotid arteries 148 54. A basic fracture with laceration of the cavernous sinus 149 55. A basic fracture with laceration of both lateral sinuses 151 56 A and B. The operative treatment of subdural hæmorrhage 156, 157 57. The areas concerned in speech expression 163 58. The cortical motor and sensory areas 165 59. The König-Müller osteoplastic flap 197 60. The author’s method of covering in a gap in the skull 199 61. A case of traumatic orbital aneurysm 207 62. A glioma of the brain 211 63. A sarcoma of the brain 211 64. An endothelioma of the dura mater 212 65. A fibroma of the dura mater 212 66. An acoustic tumour 213 67. Symmetrical tuberculomata 214 68. The cortical motor and sensory areas 220 69. The visual paths 223 70. A pituitary tumour 226 71 A, B and C. The exposure of a tumour by osteoplastic flap 230, 231 72. Combined flap formation and decompression 235 73 A, B, C and D. The exposure of a cerebellar tumour by craniectomy 239-41 74 A and B. To illustrate the extension of disease from the tympanic cavity and the surgical anatomy of that region (after Hunter Tod) 251 75. A large right-sided temporo-sphenoidal abscess 256 76. To illustrate the pressure effects of a temporo-sphenoidal abscess 257 77. A cerebellar abscess 259 78. To illustrate diagrammatically the symptoms observed in cerebellar abscess formation (after Luciani) 261 79. The exposure of a temporo-sphenoidal abscess 265 80. The ‘radical’ mastoid operation (after Hunter Tod) 269 81. Exploration for a temporo-sphenoidal abscess (after Hunter Tod) 270 82. Exploration for a cerebellar abscess (after Hunter Tod) 271 83.