Sherlock Holmes - Deductions

“I perceive that you have been unwell lately. Summer colds are always a little trying.”
“Your neighbour is a doctor.” said he, nodding at the brass plate.
“Yes, he bought a practice as I did.”
“An old-established one?”
“Just the same as mine. Both have been ever since the houses were built.”
“Ah! then you got hold of the best of the two.”

“He did not turn pale. He was pale when we entered the room,”

“Well, the whole thing hinges upon two points. The first is the making of Pycroft write a declaration by which he entered the service of this preposterous company.”