The Secretion of Uric Acid by the Fowl, by O. S. Gibbs, Physiological Abstracts, 1929, p. 302.

The bird's kidney can be perfused through the urether. Fluids enter the kidney as high as Bowman's Capsule. The pressure required is low. True selective absorption of such fluids was not demonstrated. After a short time the uric asid secreting mechanism becomes injured. It is inferred therefore that tubular absorption is not normal, though it can occur. The secretion pressure in the fowl's kidney is 10-20 c.M. of water. It is considered that uric acid is actively secreted by the bird's kidney, while water is probably filtered off by the glomeruly.