Up and to my office, whither I search for Brown the mathematical instrument maker, who now brought me a ruler for measuring timber and other things so well done and in all things to my mind that I do set up my trust upon it that I cannot have a better, nor any man else have so good for this purpose, this being of my own ordering. By and by we sat all the morning dispatching of business, and then at noon rose, and I with Mr. Coventry down to the water-side, talking, wherein I see so much goodness and endeavours of doing the King service, that I do more and more admire him. It being the greatest trouble to me, he says, in the world to see not only in the Navy, but in the greatest matters of State, where he can lay his finger upon the soare (meaning this man’s faults, and this man’s office the fault lies in), and yet dare or can not remedy matters. Thence to the Exchange about several businesses, and so home to dinner, and in the afternoon took my brother John and Will down to Woolwich by water, and after being there a good while, and eating of fruit in Sheldon’s garden, we began our walk back again, I asking many things in physiques of my brother John, to which he gives me so bad or no answer at all, as in the regions of the ayre he told me that he knew of no such thing, for he never read Aristotle’s philosophy and Des Cartes ownes no such thing, which vexed me to hear him say. But I shall call him to task, and see what it is that he has studied since his going to the University. It was late before we could get from Greenwich to London by water, the tide being against us and almost past, so that to save time and to be clear of anchors I landed at Wapping, and so walked home weary enough, walking over the stones. This night Sir W. Batten and Sir J. Minnes returned [from] Portsmouth, but I did not go see them.