This year has started with an avalanche of addenda, most of which go way back in time. On the average, I write an addendum a day. This makes me more than happy, for I want to dedicate myself to the entire collection of my writings rather than the latest additions to it. But I have noticed lately that I prefer to write addenda to pieces that already sport a few of them rather than pieces that are still free from them. In a sense, the intervening addenda provide welcome bridges to the past. Pieces without them thus strike me as remote or maybe even unreachable over time. The last addendum I wrote today extended a piece written in 1985, but it was the third one in a row. The first was written in 1987 and the second in 1995. The previous addenda invited yet another addendum, as it were. If pieces of writing are hooks where addenda can be hung in the future, the addenda are second-order hooks in turn, or hooks on hooks (“Hooks,” January 13, 2015). As if I needed any more of them…