XVI.--THE ORGANS
XVII.--ARTERIAL AND VENOUS BLOOD
XVIII.--ATMOSPHERIC PRESSURE
XIX.--THE ACTION OF THE LUNGS
XX.--CARBON AND OXYGEN
XXI.--COMBUSTION
XXII.--ANIMAL HEAT
XXIII.--ACTION OF THE BLOOD UPON THE ORGANS
XXIV.--THE WORK OF THE ORGANS
XXV.--CARBONIC ACID
XXVI.--ALIMENTS OF COMBUSTION
XXVII.--ALIMENTS OF NUTRITION (_continued_)--NITROGEN OR AZOTE
XXVIII.--COMPOSITION OF THE BLOOD


SECOND PART.

ANIMALS.

XXIX.--CLASSIFICATION OF ANIMALS
XXX.--MAMMALIA (_Mammals_)
XXXI.--MAMMALIA. (_Mammals_)--_continued_
XXXII.--MAMMALIA--_continued_
XXXIII.--MAMMALIA--_continued_
XXXIV.--AVES. (_Birds_)
XXXV.--REPTILIA. (_Reptiles_)
XXXVI.--PISCES. (_Fishes_)
XXXVII.--INSECTA. (_Insects_)
XXXVIII.--CRUSTACEA--MOLLUSKA. (_Crustaceans and Mollusks_)
XXXIX.--VERMES--ZOOPHYTA. (_Worms and Zoophytes_)