Paul Jouve illustrated several publications based on Rudyard Kipling's Jungle Book stories. The images shown here are from Le Second Livre de la Jungle, 1919, and they were reproduced surprisingly small. About 4 x 2.5".
I love the striking compositions and powerful poses of the animals. These are engravings, by the way. Jouve, as you can see, was an expert when depicting big cats, so naturally he is currently on my radar, because there is a ton I can learn from this guy.
Go here for a previous post on the great Paul Jouve: (Update: THIS is the correct link)