Hi David,
I don't think anyone has ever been able to determine what became of Polar--would be interesting to know!
Here's a little extra information about the tragedy that befell Douglas. I found this in the Bangor Daily News, Bangor, Maine, August 10, 1915, page 10. It is not a separate notice but appears under a column of local news from the town of Winter Harbor. I've left the spelling errors intact.
"A sad accident occurred Friday about 6 P.M. The 11-year-old son of F. O. Spidding was fatally injured while attempting to pick up a tennis ball in front of the Thompson cottage, in the main street. Just after he emerged from a thick shrubbery which is close to one side of the street, he collided with an automobile."
"Because of the suddenness of the entrance and the small distance, the driver, Foster Harrington, was unable to avoid a collision. The boy was picked up unconscious and carried to his home by the driver. He regained consciousness the next day but Saturday night grew worse and died Sunday morning."
As an aside, the driver who struck Douglas, Foster Harrington, was a 27 year old man who lived in Bar Harbor. After the accident he continued to live there and married and had 9 children, several of whom are still living. He held several town offices during his lifetime and was on the Winter Harbor School Board for many years and lived a happy life although his daughter tells me that he was haunted by the accident and seldom spoke about it--though sometimes in later years he would stare at the spot where the accident happened when the family drove by the site. He lived to the ripe old age of 87 and is buried in Winter Harbor.
I hope the above is of interest.
Phillip