=Summary Results from Public School Reports.=—1. A large number of children with poliomyelitis show pathologic conditions of the nose and throat, either diseased and hypertrophied tonsils and adenoids, or both. 2. A large number show marked hyperemia of the nasopharynx and throat, often resembling a scarlet or streptococcus throat. 3. Only a small percentage of cases previously operated for tonsils and adenoids were found to be affected with the disease, and in this group of cases the percentage of recovery was very much higher than in unoperated cases. The number of cases in this group is, of course, rather small to draw from it any definite conclusion, but it is at least suggestive. In another investigation of 1404 children in the public schools, made to determine whether any of them whose tonsils had been removed had been ill with poliomyelitis during the recent epidemic, a similar result was obtained. Of the 1404 children whose tonsils had been operated upon not one developed poliomyelitis during this epidemic, although in 18 instances cases developed in the family, and in 93 instances cases developed in the same house. Poliomyelitis defined: _Polio_ (gray), _myel_ (marrow), _itis_ (inflammation), meaning inflammation of the gray matter of the spinal cord. =Pathology= of the disease: Infantile paralysis is a general infection, with lesions most marked in the central nervous system. Clinical manifestations exhibit a wide-spread and scattered motor paralysis or weakening. The large majority of all cases are of the central nervous system, but there are variations in which the symptoms are not of the usual kind. =Classification.=—1. _Non-paralytic or Abortive Type._—These are cases in which the nerve-cells are not sufficiently injured to produce paralysis; and those classed as meningitis cases, tuberculous meningitis without motor disturbances, often called encephalitic; in these cases the motor cortical areas are not involved, but there is evidence of disturbance of the sensorium. 2. _Ataxic Type._—Here the motor cells are evidently not involved, but there is a lack of co-ordination—ataxia, nystagmus. 3. _Cortical Type._—The upper motor neuron is here affected, with resulting spastic paralysis. 4. _Ordinary Spinal or Subcortical Type._—Here the lower motor neuron is affected, with resulting flaccid paralysis; a manifestation of poliomyelitis difficult to classify is blindness. The most important symptoms of the disease may be described under the _non-paralytic_ or _abortive_ cases and those of _ordinary spinal form_.