Dear Sir,

Your last work as also the precedents I read with very much interest.¹ I beg you to accept the few remarks I made as a little proof of high esteem I have for you. Your Theorie gains every day more adherents.

I have been nearly ten years in Africa crossing over the continent from Tripolis by the lake of Tshad² to the coast of Guinea. I should be glad if I could fournish still more facts to your wise doctrine.

Yours very faithfully and obediently | Dr. Gerhard Rohlfs | medalist of the r. geogr. Society of London.³ I beg to excuse my bad englisch being german.

adr. D^r G. Rohlfs Weimar in Germany.

t. p. 149. The sheeps fournished with wool of North-Africa lose the wool as soon as they are driven in the hot oasis of the Sahara. Usualy already after one year the wool change to hair, and the young ones are born with hairs, not with wool. (own experience)⁴

Mental powers: It is very known that the cats never public to ease themselves, but they dig a hole, and afterwards they cover it by scraping something over. I believe this is bashfulness.

Being in Rhadames⁵ in 1865, I had a dog which never bite strangers once admitted into my house. One day Touareg⁶ being my guests and sitting close to me occupied to eat, the dog from behind sneak near and bite one of the Touareg very severly. I believe envy was the motive.

t. I. p. 216.⁷ I am convinced, that in Europe the half of the caucasians, if the they had black colour and curled hair, would resemble to Negros. On the other hand I observed very nomerous negros which would resemble entirely white men, if they only were endowed with long hair and white skin.

t. I. p. 221. I observed that in the large oasis of Draa, Tafilet and Tuat (great Sahara of Africa) which are inhabited exclusive by hybridous-people (Mischlingsvolk) procreated partly by white Arabians and Barbarians, partly by black negros of the Haussa- Bornu- and Wadai-family—that the fertility of this hybridous people was extraordinary great.⁸

t. I. p. 224. I observed in Africa very frequent, that by marriage of a black with a white either a complete black or complete white childe was produced. Sometimes a red child, but sometimes was produced a black and white child i.i. parts of the scin were black, parts white, last case was very seldom.⁹

t. I. p. 242. weight must also be given etc etc. I thing the residence of the Dutch families in Southern-Africa could not be occasion to darken the skin. The dutchmen stay there between the 30^o and 35^o S.L. This is corresponding in climatic reference to 35^o–40^o N.L. It is known that the southern hemisphere has a much colder climat on account of the more waterish character, than the northern. In this latitude live in Europe greecs, Italians, Spaniards etc, to whom we give no darker complexion than that deduced from sunshine. In northern Africa the arabians and Barbarians are very dark (teint basané)¹⁰ as soon as they are nomades; but they are very white as soon as they are dwelling in towns (the maures, Mauren, Mooren, los moros) it is, when they are not exposed to sunshine.¹¹

t. II. p. 224. Every one quoted by you has never been in the great Sahara. I observed (I crossed the Sahara tree times) that at least there are so many animals in the desert having different colour than others with corresponding colour of the terrain or ground.¹²

t. II p. 350. I have had the opportunity to state the same sentiments of beauty as Mr. W. Reade. Namely in Bornu, in Haussa and in countries inhabited by the Pullo-tribes I found the same sentiments and ideas of beauty as ours.¹³