Alkalosis in the Vomiting of Infancy.

Alkalosis and reduction of blood chlorides are known to occur in some cases of pyloric stenosis in infants (Hartmann and Smythe', Graham and Morris2, Maizels, McArthur and Payne3). The present investigation endeavours to determine how far such changes are characteristic of this malady. To this end, the chemical and clinical findings in consecutive cases occurring at the Infants' Hospital have been analysed and compared with the findings in other forms of vomiting. Certain forms of vomiting have been excluded: namely, vomiting in infants over three months old; vomiting accompanied by diarrhoea, and vomiting cases which had received alkalis medicinally. Conditions investigated.-The cases investigated are classified as follows