Haemophilia and Colour Blindness Occurring in the Same Family.

THE association of haemophilia and colour blindness in one family is not common. The family about to be described was found as a result of deliberate search amongst known haemophilic families in the West of Scotland. Seven haemophilic pedigrees were investigated as far as practicable and the affected members were examined for colour defects. Ishihara's iso-chromatic plates were used in all cases and the findings were confirmed by another method which varied according to circumstances. Stilling's plates, the Edridge-Green lantern, bead, and wool tests were used as confirmatory tests. Introduction to the families was obtained through hospital and clinic records, where the diagnosis of haemophilia had been definitely confirmed in at least one member of the family. I am very much indebted to the physicians and surgeons who have permitted me to examine their patients and have access to their records. Only one pedigree was obtained from a dental clinic which was undoubted haemophilia. Prolonged haemorrhage following the extraction of teeth, without other clinical evidence, and no definite family history, is not uncommon in both male and female children. Eight children of this type were examined and no colour defects were found. Such