The citrus industry in Florida has frequently suffered from severe freezes. The most disastrous of these probably were the freezes of 1835, 1886, and 1894- 95, which killed or seriously injured almost every tree in the State. Other minor freezes have occurred from time to time, which, while not so severe, have seriously damaged many orange groves. In California and Arizona, also, citrus trees are frequently injured by severe cold. It is thus clear that the most desirable improvement in the orange and other citrus fruits is the securing of varieties which can endure lower degrees of temperature and which may be grown throughout the present orange-producing sections without danger of injury by cold.