4)General Barker was in a hurry to get everything ready for the experiment.
The connotative meaning the secondary meaning of a sentence or word. In the original sentence, General Barker is not actually making Thanksgiving dinner for twenty people. However, he is undertaking a task just as difficult. Traditionally a Thanksgiving dinner has many dishes and requires a lot of time, preparation, and elements. This comparison is meant to show how General Barker's experiment has a lot of different elements and things that need to be ready at precisely the right time, so he is hurrying about to make sure everything is ready.