CONTENTS. IX 



lation of the blood and its uses, 159 ; 38, on the composition 

 of the atmosphere, 164; 39, on the necessity of exposing 

 the venious blood to the air, 165; 40, on the valves of the 

 veins and arteries, 173 ; 41, on the germination of seeds 

 which have passed unbroken through the stomachs of ani- 

 mals, 184 , 42, referring to Appendix on the stomach of the 

 horse, 186 ; 43, on the necessity of certain sensibilities in 

 the body, 191 ; 44, referring to Appendix for observations 

 on the lungs, 193. 



CHAPTER XL 



OF THE ANIMAL STRUCTURE REeARDED AS A MASS. 



i. Correspondence of sides, 196 ; not belonging to the separate 

 limbs, 198; nor to the internal contents, 199 ; nor to the 

 feeding vessels, ib. ; ii. package, 200; heart, 201 ; lungs, 

 202 ; liver, 203 ; bladder, ib. ; kidneys, ib. ; pancreas, ib ; 

 spleen, 204 ; omentum, ib. ; septa of the brain, ib. ; guts, 

 205 ; iii. beauty, 207 ; in animals, 208 ; in flowers, ib. ; 

 whether any natural sense of beauty, 209 ; iv. conceal- 

 ment, 211 ; V. standing, 212; vi. interrupted analogies, 

 216 ; periosteum at the teeth, ib. ; early skin at the nails, 

 217; soft integuments at the skull, 218; 



JVote 45, on the spleen, 204; 46, on the sensibility by which we 



are enabled to balance the body, 214 ; 47, referring to the 



Appendix for a dissertation on the teeth, 217 ; 48, on the 



use of the nails of the fingers, 218; 49, referring to the 



-Appendix for a note on the form of the skull, ib. 



CHAPTER XII. 



COMPARATIVE ANATOMY. 



i. Covering of animals, 222; of man, ib ; of birds, 223; struc- 

 ture of feathers, ib. ; black down, 228 ; ii. mouths of 

 animals, 229; bills of birds, 231; serrated bills, 233; 

 affinity of mouths,. 236; iii. gullets of animals, ib; iv. 



