Both Uses

although
in
Flowers for Algernon — Short Story
(Edited)

Dr. Strauss on the other hand might be called a genius, although I feel that his areas of knowledge are too limited.
p. 13.9

although = even though
As I review the records and data on Algernon, I see that although he is still in his physical infancy, he has regressed mentally.
p. 17.9 *

Definitions:

(1) (although)
even though -- used to introduce an idea that contrasts with or makes the main statement surprising

At the start of a sentence, although can play a role similar to words like however, yet, still, even so, on the other hand, or nonetheless—all of which signal contrast. In the middle of a sentence, although can sometimes be used where but or though might also work, but though or but often sound more natural. For example, "She's a great teacher, though not the most popular" is usually smoother than "She's a great teacher, although not the most popular."
(2) (meaning too rare to warrant focus)