One day she took us to see the Wellcome Laboratories, which we started talking about a moment ago, and these were at that time just housed in a few of the rooms of the Gordon College; they had built a lab of their own. And at the time we went in, the morning we went in, there were two expeditions coming in from the country. One was a medical one dealing with sleeping sickness, and they had a terrible number of photographs of the condition of the people there, which was very heartbreaking. The other expedition was a geological one, and they had amongst other finds, three or four little pellets of gold which had been got from this expanse of streams, and then they showed us how it had been found by taking their three or four little pellets, and throwing them into a basin full of sand, and then moving it...

[Q] Rinsing the water away?

Rinsing the water off. So they... gradually the gold appeared, I'm glad to say. We were very excited by this operation, that we went back to look at the stream in our back garden, and could see that it had a sort of black colour sediment. So then we borrowed a basin from the kitchen and filled it with water, and a lot of the sediment, and, and shook it in the appropriate way until we had isolated a good lot of the sediment, which looked like shiny, crystalline material. And I thought that we'd better find out what it was, so the natural thing to do was to take it over to the Wellcome lab and asked to try... I thought just preliminary tests would probably show - I guessed it might be manganese dioxide, but it wasn't, and in fact, AF Joseph had to help me find it, because it contained a metal which was not...

[Q] He had a...

Was not in our school chemistry books. It was ilmenite, a mix, oxide of iron and titanium, much later found on the surface of the moon, which gave me a lot of pleasure.