Amethyst under polarized light Size:S: 36 x 28cm The duel between the rival

The duel between the rival Auto Union and Mercedes teams was a feature of motor racing in the 1930s

Felice Nazzaro driving through Pettralia Sottana in a Fiat

another customer receives gentler but discourteous treatment (right)

star of Hithcock's 1963 classic "The Birds"

It was partly through works such as Colenso's

Amethyst under polarized light Size:S: 36 x 28cm The duel between the rivalSixteen figures showing specimens of amethysts viewed under polarized light and exhibiting veined structures. Brewster notes in his text: 'The observations are the result of an immense variety of experiments, which accidental circumstances put it in my power to make upon this interesting mineral. Having access to whole bagfuls of amethystine pyramids from the Brazils, in the possession of Mr Alexander, lapidary in Edinburgh, I have examined some