128 PHYSICAL INVESTIGATION. [PART I. 



louse does not perish under the equator,, there is no occasion to 

 dwell further on this point. It is scarcely necessary to observe, 

 that the domestic swine, though not specifically different from 

 the wild hog, has a parasite which is wanting in the latter : 

 the colour of these animals changes with the colour of 

 the skin, on which account Sommering 1 did not consider the 

 pediculus nigritarum as of a different species from the Eu- 

 ropean louse. It seems also certain that both the head louse 

 and the p. pubis of Negro nurses passes to white children. 2 

 Quandt 3 is at any rate incorrect when he asserts, that the fleas 

 and lice of Indians and Americans did not infest Europeans. 

 Neither do the various species of intestinal worms exclusively 

 infest one race, though one species may more or less predomi- 

 nate in any people. Thus in England, Holland, and Germany 

 the tcenia solium prevails ; in Switzerland and in Russia, 

 down to Konigsberg, bothriocephalus latus ; in the south-east 

 of France both prevail ; in Abyssinia and among the Hottentots 

 tcenia predominates. 4 



Another proof of the physical superiority of the white has 

 been brought forward, namely, their capacity of being acclima- 

 tized in every zone. This, however, can only apply to the inhabit- 

 ants of the temperate zone. If it be confirmed that the Sandwich 

 Islanders, who live under the 20 N. lat., become excellent 

 sailors, and can better support a cold climate than even the 

 sailors of Boston, as mentioned by Duhaut Cilly, 5 then the 

 perhaps merely theoretical assertion of Jarrold, that the Negro 

 is, by the structure of his skin, better protected against climatic 

 influences, and can alike thrive in every climate, is hardly correct. 

 That savages cannot support the influence of climate as well as 

 civilized people is mainly owing that the latter accommodate 

 themselves to the climate by care and corresponding changes 

 in their mode of life, which the uncivilized neglect. HenCe it 

 has been asserted that it is merely by the force of his intellect 

 that man can subsist in every clime. This seems to be con- 



1 " Ueber die korperl. Verscht. des Negers v. Europ.," p. 8. 



2 Bachmann in Smith, " The Unity of the hum. races," p. 184, 1850. 



3 " Nachr. v. Surinam," p. 221, 1807. 



4 Owen, " Lect. on Comp. Anat. of the invertebrate animals." 



5 " Voy. autour du monde," ii, p. 302, 1834. 



