ANALYSIS OP THE LESSONS. XXV 



1055. And Articulata. 1056. The Radiate Class. 1057. He endorses Tiede- 

 mann. 1058. But divides the class. 1059. The lower animals exhibit the 

 effects of a nervous system. 1060. It is presumed to exist. 



LESSON LXX. NERVOUS SYSTEM, CONTINUED, p. 234. 



1061. The three first classes, well defined by Owen; the last, doubtful. 

 1062. Hunter's preparation of Asterias papposa. 1063. Tiedemann's Echino- 

 dermata. 1064. His description of the vascular system, quoted. 1065. Iden- 

 tity of the vascular and nervous systems. 1066. Causes that may have led to 

 error. 106*7. The necessities of a nervous system. 1068. Does a nervous sys- 

 tem exist without a ganglion? 1069. A ganglion described. 1070. How to 

 define a nerve, or ganglion. 1071. Plants exercise their functions without a 

 nervous system. 1072. Inquiries to commence with the Articulata. 



LESSON LXXI. NERVOUS SYSTEM IN THE ARTICULATA. ENTOZTOA 



ANNELLIDA, p. 236. 



1073. Nervous system imperfectly developed in the Entozoa. 1074. Its 

 condition in Strongylus gigas. 1075. And in the Ascarides. 1076. The ANNEL- 

 LIDES present a marked advance. 1077. Their organs of sense. 1078. A 

 higher type of development attained. 1079. How it commences. 1080. Ner- 

 vous system in the Leech. 1081. Description continued. 1082. And con- 

 cluded. 1083. Nervous system in the Earth-worm. 1084. The like in the 

 Nereis. 1085. Ganglia in Eunice gigantea. 



LESSON LXXII. NERVOUS SYSTEM OP CIRRIPEDIA AND MYRIOPODA, . p. 239. 



1086. The nervous system simple in the Cirripeds. 1087. Its condition de- 

 scribed in Lepas vitrea. 1088. The MYRIOPODS described. 1089. The condi- 

 tion of their nervous system. 1090. The brain of lulus described. 1091. De- 

 scription continued. 1092. Continued. 1093. Continued. 1094. Concluded. 

 1095. Nervous system in Pdydesmus maculata. 1096. Continued. 1097. -The 

 same in Scolopendra. 1098. Nervous system in this class, contains the leading 

 divisions of the higher animals. 1099. Demonstration. 1100. Sympathetic 



LESSON LXXIII. NERVOUS SYSTEM IN CRUSTACEA, p. 242. 



1101. The nervous system possesses great scope of development in this 

 class. 1102. General description of the brain. 1103. The Ganglia of the Ce- 

 phalo-thorax. 1104. Nervous system of the Sand-hopper. 1105. Description 

 of it. 1106. Nervous system of the Cymothoa. 1107. Nervous system in the 

 Lobster and Cray-fish. 1108. Nervous system most concentrated in the Crabs. 

 Description. 1109. Description concluded. 



LESSON LXXIV. NERVOUS SYSTEM IN INSECTS, p. 244. 



1110. The nervous system in insects. 1111. Its condition in larvae. 1112. 

 Nervous system of Cossus ligniperda. Analogue of the brain and spinal chord. 

 1113. Description of nervous system. 1114. Description continued. 1115. 



