A book on convalescent serums seems particularly valuable at this time. An understanding of what can be expected from them and of the necessary precautions to be taken in preparing and administering them is certainly necessary. The author has had a great deal of experience with this type of therapy and of prevention, and he describes its development with unusual clearness.
Special chapters are given to a discussion of the use of convalescent serum in preventing and treating measles, scarlet fever, mumps, whooping cough and poliomyelitis. An interesting chapter gives particulars concerning the use of serum from a person who recently had been vaccinated successfully in the treatment of encephalitis associated with vaccination for smallpox. Another interesting point brought out concerns the use of convalescent serum in mumps. Here, serum must not be taken from a person who himself has been treated with convalescent serum, as the use of such