Capillary Blood Vessels of Larval Frog
Capillary blood vessel of the tail of a young larval frog. a, capillaries permeable to blood; b, fat granules attached to the walls of the vessels, and concealing the nuclei; c, hollow prolongation of a capillary ending in a point; d, a branching cell with nucleus and fat granules; it communicates by three branches with prolongation of capillaries already formed; e, blood corpuscles still containing granules of fat.
Baker, W. Morrant & Harris, Vincent Dormer Kirkes' Hand-book of Physiology, 13th ed. (Philadelphia: P. Blakiston's Son & Co., 1892) 820