1. Summer Number;Brain,1901
2. Such as (1) the muscular fibres in the lymphatic vessel walls; (2) the suction effect produced by respiration; and (3) the low blood-pressure in the subclavian vein.
3. Waller in speaking of the coagulation of muscle plasma says: " The myosin coagulum having formed is thus easily unmade and re-made out of the body; perhaps this is also the case in the body" (Human Physiology, third edition, p. 320).