This paper examines the institutions, personages, and theories that informe
d acclimatization activities in nineteenth-century France, England, and the
two colonies of Algeria and Australia. Treating acclimatization as a scien
tific concept and activity, the essay begins with the conditions of its eme
rgence in Enlightenment France. Subsequent sections trace the growth of the
acclimatization movement and its translation to the British context, and c
onsider reasons for its decline in the last third of the nineteenth century
. Efforts are made to show why many perceived acclimatization to be the par
adigmatic colonial science with applications as diverse as agriculture, set
tlement schemes, field sports, and human health. Emphasis falls on the Fren
ch and British cultural spheres, as these were the dual epicenters of both
modem colonialism and organized acclimatization activity.