It is considered important to clarify the mechanism controlling flow of body fluid in the heart，blood vessel system and lymphatic system when viewed from the concept of body
fluid circulation instead of blood circulation.
Experiments were conducted on dogs to study relation between blood constituents， blood
pressure and lymph flow. Further， experiments with frogs were conducted with respect to
nerve reflexes from the blood vessel system and heart to the posterior lymph heart.
Variation in lymph flow was observed according to these factors.