From W. H. Miller   8 March [1845]

My dear Darwin

Pray excuse me for not having sooner given an account of the crystals you sent me—I was busy with lectures and other matters for some time after they came— The cleavage planes are very dull and uneven. I could make nothing of them except by using sun light for the upper signal. The angles usually fell within 15’ of 90^o, but different parts of—apparently the same cleavage plane—tho’ in fact cleavage planes of different crystals aggregated together in positions nearly but not quite parallel—differed in position full 15’ not unfrequently. So that I have little doubt of the identity of the crystals with Potash Feldspar¹

I regret very much to hear that your health is indifferent. I am well. I have at last been able to escape from College and marry—² I live in Cambridge where I hope some time to have the pleasure of seeing you

I remain | Dear Darwin | Yours very truly | W H Miller