The article you cited in your post yesterday was from the school. The next page 143 says...
literature. He thought at first of following a literary career, but he eventually
decided on becoming an analytical chemist, for which also he had an aptitude. Soon
after the outbreak of war, though still under age, he offered himself to the Scottish
Branch of the Red Cross Society as motor ambulance driver, and served for six
months in Rouen. Thereafter he joined the Infantry Training Reserve, and was
later transferred to the Royal Air Force as a cadet, receiving his commission in
April, 1918. During his period of training he paid frequent visits to his old School,
and all were delighted to see how month by month he grew not only in stature but
in character. Straight and lithe, he looked a fine figure in his pilot's dress, and
alertness and resolution looked out from every feature. On the 11th of September,
1918, he left for France as a reconnaissance and day bombing pilot. Writing home
soon after, he says that he was frequently up and across the German lines three
times a day, a heavy strain for a youth of barely nineteen. On the 6th October
he set out on special reconnaissance work on the coast in the neighbourhood of
Dixmude. He failed to return, and though the most searching inquiries were made,
no definite information as to his fate has yet been received. His squadron com-
mander wrote — " He was a very popular boy, and was marked out as a coming
leader of the squadron." The utmost sympathy of the School goes out to his
parents, brother and sisters, who have had to endure so long and trying a suspense.
http://digital.nls.uk/rolls-of-honour/pageturner.cfm?id=100541647&mode=transcription 