Hoff, C. von, influence of his works on Lyell, [49]

Hooker, J. D., friendship with Lyell's father, [126];

voyage to Antarctic with Ross, [126];

introduction to Darwin, [126];

correspondence with, [127];

assistance to Darwin, [126];

advice to, [129];

on origin of Australian flora, [139];

friendship with Lyell, [79], [126]

Hutton, his Theory of the Earth, [17], [18], [19], [20];