CONTENTS OF VOLUME II.

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### REMARKS ON THE STYLE OF LEONARDO'S ARCHITECTURE	100—104

XIV. ANATOMY, ZOOLOGY, AND PHYSIOLOGY

	105—133

I. ANATOMY:—A general introduction (796).—Plans and suggestions for the arrangement of materials (797—802).—Plans for representing muscles through drawings (803—809).—On obesity original: "corpulency" and thinness (809—811).—The divisions of the head (812. 813).—Physiological problems (814. 815).—II. ZOOLOGY AND COMPARATIVE ANATOMY:—The divisions of the animal kingdom (816. 817).—Miscellaneous notes on the study of Zoology (818—821).—Comparative study of bone structure and the action of muscles (822—826).—III. PHYSIOLOGY:—Comparative study of the sensory organs original: "organs of sense" in humans and animals (827).—Advantages in the structure of the eye in certain animals (828 to 831).—Remarks on the organs of speech (832. 833).—On the conditions of sight (834. 835).—The seat of the common sense original: "sensus communis"; in Renaissance physiology, this was the specific part of the brain where all sensory input was thought to be processed and coordinated (836).—On the origin of the soul (837).—On the relationship between the soul and the sensory organs (838).—On involuntary muscular action (839).—Miscellaneous physiological observations (840—842).—The laws of nutrition and the support of life (843—848).—On the circulation of the blood (848—850).—Some notes on medicine (851—855).

XV. ASTRONOMY

	135—172

I. THE EARTH AS A PLANET:—The Earth's place in the universe (857. 858).—The fundamental laws of the solar system (859—864).—How to prove that the Earth is a planet (865—867).—The principles of astronomical perspective (868 to 873).—On the luminosity of the Earth in universal space (874—878).—II. THE SUN:—The question of the true and the apparent size of the sun (879—884).—On the nature of sunlight (885).—Considerations regarding the size of the sun (886—891).—III. THE MOON:—On the luminosity of the moon (892 to 901).—Explanation of the ashen light original: "lumen cinereum"; the faint glow on the dark part of the moon caused by sunlight reflecting off the Earth, also known as earthshine of the moon (902).—On the spots on the moon (903—907).—On the moon's halo (908).—On instruments for observing the moon (909. 910).—IV. THE STARS:—On the light of the stars (911—913).—Observations on the stars (914).—On the history of astronomy (915).—Of time and its divisions (916—918).

XVI. PHYSICAL GEOGRAPHY

	173—221

INTRODUCTION.—Schemes for the arrangement of the materials (919—928).—General introduction (929).—I. ON THE NATURE OF WATER:—The arrangement of Book I (930).—Definitions (931. 932).—On the surface of the water in relation to the globe (933—936).—On the proportion of the mass of water to that of the earth (937. 938).—The theory of Plato (939).—That the flow of rivers proves the slope of the land (940).—Theory of the rising of water within the mountains (941).—The relative height of the surface of the sea to that of the land (942—945).—II. ON THE OCEAN:—Refutation of Pliny's theory regarding the saltness of the sea (946. 947).—The characteristics of seawater (948. 949).—On the formation of gulfs (950. 951).—On the encroachment of the sea on the land and vice versa (952—954).—The ebb and flow of the tide (955—960).—III. SUBTERRANEAN WATERWAYS:—Theory of the circulation of water (961. 962).—Observations in support of the hypothesis (963—969).—IV. ON RIVERS:—On the way in which the sources of rivers are fed (970).—The tide in estuaries (971).—On the alterations caused in the courses of rivers by their joining original: "confluence" (972—974).—Whirlpools (975).—On the changes in the channels of rivers (976).—The origin of sand in rivers (977. 978).—V. ON MOUNTAINS:—The formation of mountains (979—983).—The authorities for the study