________________________________________________________________________ This is a most remarkable book, copiously illustrated with interesting engravings.  A young boy and his brother are sent home early from their boarding-school, because of illness among the pupils.  Their father is a retired captain in the Royal Navy, who has had a beautiful yacht built. He suggests that the family should spend this lengthened summer holiday sailing round England.  This means sailing round the southern part of Scotland, passing through the Caledonian Canal.