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 or four times as large as a louse, and not very different in shape; but armed with four or five rows of prickles like a hedgehog, which seem to serve it as feet. Its motion is very sluggish. It lies drenched in the aforesaid mass, which swarms with these animals of all ages from top to bottom.… I have gone over Sir James Stewart’s great book of political economy, wherein I think there is a great deal of good material—carelessly put together indeed; but I think it contains more sound principles concerning commerce and police than any book we have yet had. We had the favour of a visit from Sir Archibald Grant. It gave me much pleasure to see him retain his spirits and vigour.' A letter in October mentions that Reid had 'passed eight days lately with Lord Kames at Blair-Drummond,' and that his lordship is preparing a fourth edition of his Elements. He adds, 'I have been labouring at Barbara Celarent for three weeks bygone.' A new friend, Lord Kames, here comes in sight.

The last of the Skene letters is dated three years later, in 1770. After pressing David Skene to visit him in Glasgow, he ends thus:—'As to myself, the immaterial world has swallowed up all my thoughts since I came here; but I meet with few that have travelled far in that region, and am often left to pursue my dreary way in a more solitary manner than when we used to meet at the Club.'

The homely simplicity of Reid’s character is shown in those letters. They differ from the letters we have after the Skenes disappear. These are almost all on questions in philosophy, and show a slow but steady advance in reflection upon the 'common sense' constitution of man’s knowledge of the universe of matter and mind.

In 1772 there was sorrow in the Reid household. The