“…The hemotoxin, or lysin, of the tetanus bacillus was first recognized by Ehrlich (3,4) who clearly differentiated it from the true killing toxin. Much of the lysin-inhibiting or lysin-neutralizing effect of normal sera (3)(4)(5)(6)(7) can be referred to the lipoid constituents (8,9,10,13) although several investigators (11,12) have reported that certain protein constituents are also concerned.…”