On one occasion, when he climbed a mountain with Charles Sargent, the director of Harvard’s Arnold Arboretum, Muir was amazed how a man so learned about trees could be so untouched by the magnificent autumnal scenery. While he was jumping around and singing to ‘glory in it all’, Sargent stood ‘cool as a rock’. When Muir asked him why, Sargent replied, ‘I don’t wear my heart upon my sleeve.’ But Muir was not allowing Sargent to get away with this. ‘Who cares where you wear your little heart, man,’ Muir countered, ‘there you stand in the face of all Heaven come down to earth, like a critic of
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