It is also, I should say, on the basis of this letter, which is why I ask people from time to time to remove their caps in the class room, from the House of Study.
"Pull-ad" clauses are provisions in a contract between an advertiser and a publication that give the advertiser wiggle room to remove its ads from an issue at the last minute or move them elsewhere in the publication so they don't run alongside news of major catastrophes, or even against pages containing stories about itself.
After several hours of this, learning the difference between a four-day-old horse and a cow carcass - the colour, smell, and muscle tone - the kind lady who showed us round, led us to a warm room where we could remove our hair nets and overalls and take comfort in a bowl of vegetable soup.
Joe Tortorella of Robert Silman Associates, the engineer hired to remove the stacks from under the Rose Reading Room while it's still in use, has compared his task to cutting off the legs of a table while a banquet is taking place.
