Debating with my Grandfather 
this debate is just beginning and has yet to be edited

George S Robb vs. Harry Robb Welty
If you will take a look at the map of Africa, you will note that the Equator splits the Continent very near its center. The Cape of Good Hope is 35 south of the Equator. and Algeria at the Mediterranean is 35 or 38 north of the same line. The coastal tribes of the equatorial belt and the tribes of the humid river deltas have always lived where life was easy. food was plentiful and to be had without a struggle. The rigors of nature did not kill off the weak and they propagated along with the strong, so long centuries of ease and sloth in living developed races weak, both physically and mentally.

Grandson! Please. I was speaking to men of my own era. We were all raised to believe that character was a function of inheritance and that was strongly correlated with ethnic identity. Remember that the general attitude of white men in my lifetime was that black people were inferior. I believe that people in your own time have expressed doubts about the intellectual equality of blacks. Isn't that the argument of that book "The Bell Curve?" 

Because of these prevalent attitudes I had to paint a credible picture of the powers of at least some blacks based upon what I knew of their ancsestory and history in Africa. I may have gotten my facts wrong but the principle argument you can draw from Larry Lapsley's story is that this black man measured up to and surpassed a great many white people.

Oh my God Grandfather! The last fifty years has completely obliterated this outmoded notion of evolution. Even your history is bad which I don't fault you for because African history is sketchy and no one much wrote about it when you were alive.

First where evolution is concerned life was not easy where food was plentiful. If anything competition was more keen. Other human populations would have had the same easy access to food and would have been inclined to extend into your territory to take your resources.

Hot house envionments don't necessarily have big human populations. In the book "Guns, Germs and Steel" written thirty years after your death Grandfather, , makes the point that the innovations upon which population growth are dependent have tended to be shared by populations in the same latitudes. Wheat will grow well in Asia or Europe or N America in the same latitude but will not survive a more southerly latitude as the weather is all wrong. This is true for domesticated animals as well. 

Not so fast. Grandfather. Time and again you refer to Larry Lapsley as the "negro." I'll forgive you the fact that this is the preferred word of your time for both well intentioned blacks and whites but it is such a clinical word. You could simply have said the "man" instead of the "negro" as you described Larry Lapsley's exploits. Saying Negro makes him sound like a creature from an anthropological text.