They enjoyed themselves so much that they forgot the pictures and they forgot about the time.They had been laughing quite loudly over Ben Weatherstaff and his robin，and Colin was actually sitting up as if he had forgotten about his weak back，when he suddenly remembered something.“Do you know there is one thing we have never once thought of，”he said.“We are cousins.”
It seemed so queer that they had talked so much and never remembered this simple thing that they laughed more than ever，because they had got into the humor to laugh at anything.And in the midst of the fun the door opened and in walked Dr.Craven and Mrs.Medlock.
Dr.Craven started in actual alarm and Mrs.Medlock almost fell back because he had accidentally bumped against her.
“Good Lord！”exclaimed poor Mrs.Medlock with her eyes almost starting out of her head.“Good Lord！”
“What is this？”said Dr.Craven，coming forward.“What does it mean？”
Then Mary was reminded of the boy Rajah again.Colin answered as if neither the doctor’s alarm nor Mrs.Medlock’s terror were of the slightest consequence.He was as little disturbed or frightened as if an elderly cat and dog had walked into the room.
“This is my cousin，Mary Lennox，”he said.“I asked her to come and talk to me.I like her.She must come and talk to me whenever I send for her.”
Dr.Craven turned reproachfully to Mrs.Medlock.
“Oh，sir，”she panted.“I don’t know how it’s happened.There’s not a servant on the place tha’d dare to talk-they all have their orders.”
“Nobody told her anything，”said Colin.“She heard me crying and found me herself.I am glad she came.Don’t be silly，Medlock.”
Mary saw that Dr.Craven did not look pleased，but it was quite plain that he dare not oppose his patient.He sat down by Colin and felt his pulse.
“I am afraid there has been too much excitement.Excitement is not good for you，my boy，”he said.