In the story "Flowers For Algernon" by Daniel Keyes, what evidence is there that Charlie is superstitious in his progress report from March 10?

In "Flowers for Algernon" by Daniel Keyes, we see evidence of Charlie's superstitious nature when he writes his progress report on March 10. He admits to being scared because he is about to have the operation that will change his life. In his progress report he writes about how the nurses, and the people who took part in testing him, brought him candy and wished him luck while he was waiting for the operation. 

Charlie is worried because on his way to the hospital a black cat crossed his path, and he is sure that will bring him bad luck. He also has taken with him to the hospital his rabbit's foot and lucky penny--both symbols of luck. Charlie writes about Dr. Strauss' reaction to his lucky symbols  and Charlie's own reaction to Dr. Strauss in his report. In his words: 

"Dont be supersitis Charlie this is sience. Anyway Im keeping my rabits foot with me" (Keyes 6).

Though Charlie trusts Dr. Strauss, he is not quite ready to give up this particular talisman!