All quotes from this letter he wrote, to be found here: http://www.galton.org/letters/africa-for-chinese/AfricaForTheChinese.htm
My proposal is to make the encouragement of the Chinese settlements at one or more suitable places on the East Coast of Africa a part of our national policy...
...
...the belief that the Chinese immigrants would not only maintain their position, but that they would multiply and their descendants supplant the inferior Negro race. I should expect the large part of the African seaboard, now sparsely occupied by lazy, palavering savages living under the nominal sovereignty of the Zanzibar, or Portugal, might in a few years be tenanted by industrious, order loving Chinese...
...
We ourselves are no descendents of the aborigines of Britain, and our colonists were invaders of the regions they now occupy as their lawful home. But the countries into which the Anglo-Saxon race can be transfused are restricted to those where the climate is temperate. The Tropics are not for us, to inhabit permanently; the greater part of Africa is the heritage of people differently constituted to ourselves. On that continent, as elsewhere, one population continually drives out another.
...
The history of the world tells a tale of the continual displacement of populations, each by a worthier successor, and humanity gains thereby... The gain would be immense to the whole civilized world if we were to out-breed and finally displace the negro, as completely as the latter has displaced the aborigines of the West Indies.
...
Individuals of the mental caliber I have just described are much more exceptional in the negro than in the Anglo-Saxon race, and that average negroes possess too little intellect, self-reliance, and self-control to make it possible for them to sustain the burden of any respectable form of civilization without a large measure of external guidance and support.
...
The Chinese emigrants possess an extraordinary instinct for political and social organization; they contrive to establish for themselves a police and internal government, and they give no trouble to their rulers so long as they are left to manage those matters by themselves. They are good-tempered, frugal, industrious, saving, commercially inclined, and extraordinarily prolific.
My proposal is to make the encouragement of the Chinese settlements at one or more suitable places on the East Coast of Africa a part of our national policy...
...
...the belief that the Chinese immigrants would not only maintain their position, but that they would multiply and their descendants supplant the inferior Negro race. I should expect the large part of the African seaboard, now sparsely occupied by lazy, palavering savages living under the nominal sovereignty of the Zanzibar, or Portugal, might in a few years be tenanted by industrious, order loving Chinese...
...
We ourselves are no descendents of the aborigines of Britain, and our colonists were invaders of the regions they now occupy as their lawful home. But the countries into which the Anglo-Saxon race can be transfused are restricted to those where the climate is temperate. The Tropics are not for us, to inhabit permanently; the greater part of Africa is the heritage of people differently constituted to ourselves. On that continent, as elsewhere, one population continually drives out another.
...
The history of the world tells a tale of the continual displacement of populations, each by a worthier successor, and humanity gains thereby... The gain would be immense to the whole civilized world if we were to out-breed and finally displace the negro, as completely as the latter has displaced the aborigines of the West Indies.
...
Individuals of the mental caliber I have just described are much more exceptional in the negro than in the Anglo-Saxon race, and that average negroes possess too little intellect, self-reliance, and self-control to make it possible for them to sustain the burden of any respectable form of civilization without a large measure of external guidance and support.
...
The Chinese emigrants possess an extraordinary instinct for political and social organization; they contrive to establish for themselves a police and internal government, and they give no trouble to their rulers so long as they are left to manage those matters by themselves. They are good-tempered, frugal, industrious, saving, commercially inclined, and extraordinarily prolific.