Travis works for time-safari is telling Eckels about what he can't do when he is in the past. Eckels in nervous for the time travel. Eckels is going into the past to go hunting for prehistoric dinosaurs.
time safari,inc safaris to any year in the past you name the animal we take you there you shoot it
After a bit of paper work they travel to the past Eckels is now finding it hot and very amazed at where he is Travis is telling him about the path and how he is never allowed to leave the path because it could change the history