CHAPTER XI.. The Vascular System and Vascular Glands, Pp. 460-478.

THE VASCULAR SYSTEM AND VASCULAR GLANDS, pp. 460-478.

The heart.--Its development. Comparison with other types. Meaning of double formation of heart. The general circulation. The venous system. The primitive condition of. Comparison of, with Amphioxus and Annelids. The cardinal veins. Relations of caudal vein. The circulation of the yolk-sack.--Previous observations. Various stages. Difference of type in amniotic Vertebrates. The vascular glands.--Suprarenal and interrenal bodies. Previous investigations. The suprarenal bodies.--Their structure in the adult. Their development from the sympathetic ganglia. The interrenal body.--Its structure in the adult. Its independence of suprarenal bodies. Its development.