I got a new book, so I had to take time to glance through it. Then it was time to go to lunch with friends and then to stop at an antique and collectibles store.
When we came back to my house we looked for more Monarch caterpillars and there weren't any but later in the evening I went out and there was a new one. It is smaller than the ones I saw in previous days.
The stems near the top of the Swamp Milkweed were covered with little orange wiggly things. I looked it up on the Internet and they are Aphids. One article said they will suck the life out of the plant and that guy just hoses them off with water. I'll take another look this morning and decide what to do about them.