Injected 2 c.c. m/8 BaCl_{2} solution subcutaneously. After 1st 10 min. following injection 2.5 c.c. fluid light yellow After 2d 10 min. following injection 1.6 c.c. fluid very light yellow After 3d 10 min. following injection 1.8 c.c. fluid almost colorless After 4th 10 min. following injection 1.6 c.c. fluid quite colorless After 5th 10 min. following injection 1.0 c.c. fluid quite colorless 3. Rabbit. Loop 32 cm. long. Loop contained in beginning 6.0 c.c. After 1st 10 minutes 0.4 c.c. After 2d 10 minutes 0.1 c.c. After 3d 10 minutes 0.4 c.c. Poured 5 c.c. m/8 sodium citrate on loop. After 1st 10 minutes 6.2 c.c. After 2d 10 minutes 2.0 c.c. 4. Dog. Loop 35 cm. long. Loop contained no fluid, _i.e._, none could be drained off. After 1st 10 minutes 0.0 c.c. After 2d 10 minutes 0.0 c.c. After 3d 10 minutes 0.0 c.c. Poured 3 c.c. m/8 BaCl_{2} on loop. After 1st 20 minutes 8.0 c.c. After 2d 20 minutes 0.6 c.c. Poured 1¹⁄₂ c.c. m/8 BaCl_{2} on loop just enough to moisten it. After 1st 20 minutes 3.2 c.c. After 2d 20 minutes 2.5 c.c.