The rest you will easily guess.

He had followed his old leader to America, and was now his man for everything.

It was not often that you could see the naturalist without also seeing Hugot's great moustachios close by his elbow.

It would have killed Hugot to have been separated for any length of time from his old colonel.
Of course Hugot accompanied his master in all his hunting expeditions.
So, too, did the boys, as soon as they were able to sit upon a horse.
On these occasions the house would be shut up, for there was no housekeeper nor any other domestic about the establishment.

It would remain thus for days, sometimes for weeks together--for the naturalist with his party often made distant excursions into the surrounding forests.