b< i .to. \ 
50 Congress Street. 
Boston, March 21, 1912. 
William Brewster, Esq., 
Cambridge, Mass. 
Dear Mr. Brewster;- 
Mahy thanks for your article, which I have 
just been reading with keen interest. You seem to 
has'e had an exceptionally good oportunity of witnessing 
one the mysteries of natural mechanics which has al¬ 
ways tantalized curious minds. The solution of the 
birds’ gliding upon riaing currents is an obvious one, 
but is not necessarily the only one. The air is 
really an undiscovered country, and even the be 3 t in¬ 
formed men have a great deal to learn about it, appar¬ 
ently. 
I have been flying kites and building gliders 
for some years and am in the midst of a study of the 
properties of the air relative to the support and pro¬ 
pulsion of such bodies. I have watched the gulls at¬ 
tentively for years, from steamers and from the shore. 
In stormy weather along the Maine coast they love to 
