LIST OF ILLUSTRATIONS. 



xv 



91. 



92. 

 93- 

 94- 

 95- 

 96. 



97- 

 98. 

 99. 

 100. 



101. 



102. 

 103. 



104. 

 105. 



106. 

 107. 



108. 

 109. 



no. 

 in. 



112. 



US- 

 114. 



"5- 

 116. 

 117. 

 n8. 



119. 



120. 

 121. 



122. 

 123. 

 124. 

 125. 

 126. 

 127. 

 128. 

 129. 

 130. 



IS*- 

 I 3 2. 



133- 



*34- 

 135- 

 136- 

 37- 



138. 



I39. 

 140. 

 141. 

 142. 



143- 



144. 



MS- 

 146. 



H7. 

 148. 



Human Embryo of 32 mm., 151 



Human Embryo of 34mm. Front View of Face, 152 



Human Embryo of 55 mm. Seventy-five Days, 152 



Human Embryo of 78 mm. Three Months, 153 



Front View of the Face of the Embryo Shown in Fig. 94, . 153 



Human Embryo of 1 20 mm. (? One Hundred and Ten Days), 154 



Human Embryo of n8mm. One Hundred and Six Days, 154 



Human Embryo of 155 mm. One Hundred and Twenty-three Days, 155 



Pig Embryo of 10 mm., 160 



Transverse Section of Pig Embryo of 12 mm., facing 163 



Pig Embryo of 12.0 mm. Reconstruction from the Transverse Sections, Series 5 (drawn by Dr. 



F. T. Lewis], 163 



Anterior Wall of the Pharynx of a Human Embryo of 3.2 mm. (after W. His), 164 



Aortic System of His's Embryo BJ, 4.25 mm. (after W. His), 164 



Transverse Section of Pig Embryo of 12 mm., facing 165 



Pig Embryo of 12.0 mm. Reconstruction from the Transverse Sections, Series 5 (drawn by Dr. 



F. 7\ Lewis], 165 



Transverse Section of Pig Embryo of 1 2 mm., facing 167 



Pig Embryo of 12.0 mm. Reconstruction from the Transverse Sections, Series 5 (drawn by Dr. 



F. T. Lewis), . . 167 



Transverse Section of Pig Embryo of 12 mm., Jacin% 169 



Pig Embryo of 1 2.0 mm. Reconstruction from the Transverse Sections, Series 5 (drawn by Dr. 



F. T. Lewis) 169 



Pig Embryo of 15 mm., 170 



Fig Embryo of 20 mm., 172 



Reconstruction of a Pig Embryo of 12.0 mm. with Indications of the Planes of Sections Figured, . 174 



Pig, I2.omm. Transverse Series 5. Section 185, 176 



Portion of Fig. 113 More Highly Magnified, 179 



Pig, 12. o mm. Transverse Series 5, Section 198, 182 



Pig, 12. o mm. Transverse Series 5, Section 249, 185 



Pig, 12.0 mm. Transverse Series 5, Section 292, i&& 



Pig, 12. o mm. Transverse Series 5, Section 321, 192 



Pig, 12. o mm. Transverse Series 5, Section 353, 194 



Pig, 12.0 mm. Transverse Series 5, Section 470, 197 



Pig, I2.omm. Transverse Series 5, Section 513, 2OO 



Pig, 12. o mm. Transverse Series 5, Section 633, 203 



Pig, 12. o mm. Sagittal Series 7, Section 70, 206 



Pig, I2.omm. No. 7. Sagittal Section 25, 209 



Pig, 12.0 mm. Frontal Series 6, Section 284, ' 212 



Pig, 12. o mm. Frontal Series 6, Section 340, 213 



Pig, 12.0 mm. Frontal Series 6, Section 380, 214 



Pig, 12. o mm. Frontal Series 6, Section 572, 216 



Pig, 9.0 mm. Transverse Series 9, Section 171, 218 



Pig, 9.0 mm. Sagittal Series 53, Section 213, 220 



Pig, 9.0 mm. Frontal Series 54, Section 194, 223 



Pig, 9.0 mm. Frontal Series 54, Section 194, 224 



Pig, 9.0 mm. Frontal Series, 54, Section 459, 228- 



Pig, 6.0 mm. Transverse Series 9, Section 90, 229 



Pig, 6.0 mm. Transverse Series 9, Section 519, 230- 



Pig, 17.0 mm. Transverse Series 51, Section 464, 232 



Pig, 17.0 mm. Transverse Series 51, Section 651, 236 



Pig, 17.0 mm. Transverse Series 51, Section 759, 2 3& 



Pig, 17.0 mm. Frontal Series 39, Section 63, 240 



Pig, 20.0 mm. Transverse Series 59, Section 522, 241 



Pig, 20.0 mm. Transverse Series 59, Section 522, . . .' 243 



Pig, 20.0 mm. Transverse Series 59, Section 701, 245 



Pig, 20. o mm. Transverse Series 59, Section 1253, 2 4^ 



Pig, 20. o mm. Transverse Series 59, Section 1043, 249 



Pig, 20.0 mm. Sagittal Series 60, Section 213, 252 



Pig, 20.0 mm. Frontal Section of Head. Series 40, Section 68, 254 



Pig, 2o.omm. Frontal Section of Head. Series 40, Section 84 256 



Pig, 20.0 mm. Frontal Section of Head. Series 40, Section 123, 257 



