|Behind the scenes|
|First Appearance:||The Broken Ear|
|Last Appearance:||The Broken Ear|
It is he who originally finds and re-captures the late Jacob Balthazar's parrot Polly. After doing so he answers Tintin's advertisement in the newspaper for a lost parrot, which gave him temporary custody of Polly.
He is shown as being very absent-minded by forgetting his glasses, wearing his cleaning-lady Ernestine's overcoat, holding his walking stick upside-down as if it were an umbrella, mistaking a parrot for a man and leaving his briefcase next to a lamp post.
In the more modern versions of The Broken Ear the Professor's name is not wholly revealed. However, in the original black and white edition published in 1935 his name is given as Professor Euclide, after the ancient Greek mathematician Euclid of Alexandria, who is known as the "Father of Geometry."