Exhibited by Mr. E. Nettleship.
Congenital Colour-blindness. Pedigree showing unusual features, viz.: (a) females affected; (b) twins, of whom one is affected, the other not; (c) marriage between two unrelated colour-blind stocks. Except that two females are affected the inheritance, so far as can be traced, has followed the rule for colour-blindness; viz., limitation to males and transmission through unaffected females.
Hereditary night-blindness with myopia (short sight) affecting 21 males and only 1 female in a large pedigree. The night-blindness congenital and stationary. Descent always through mothers themselves unaffected. Mental defects in several of the night-blind stock. Other pedigrees of this male-limited night-blindness are on record.
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