Sherlock Holmes - Deductions

The two men had stopped opposite the window. Some chalk marks over the waistcoat pocket were the only signs of billiards which I could see in one of them. The other was a very small, dark fellow, with his hat pushed back and several packages under his arm.
“An old soldier, I perceive,” said Sherlock.
“And very recently discharged,” remarked the brother.
“Served in India, I see.”
“And a non-commissioned officer.”
“Royal Artillery, I fancy,” said Sherlock.
“And a widower.”
“But with a child.”
“Children, my dear boy, children.”
“Come,” said I, laughing, “this is a little too much.”
“Surely.” answered Holmes, “it is not hard to say that a man with that bearing, expression of authority, and sun-baked skin, is a soldier, is more than a private, and is not long from India.”
“That he has not left the service long is shown by his still wearing his ammunition boots, as they are called,” observed Mycroft.
“He had not the cavalry stride, yet he wore his hat on one side, as is shown by the lighter skin on that side of his brow. His weight is against his being a sapper. He is in the artillery.”
“Then, of course, his complete mourning shows that he has lost someone very dear. The fact that he is doing his own shopping looks as though it were his wife. He has been buying things for children, you perceive. There is a rattle, which shows that one of them is very young. The wife probably died in childbed. The fact that he has a picture-book under his arm shows that there is another child to be thought of.”

“This young man could not talk a word of Greek. The lady could talk English fairly well. Inference — that she had been in England some little time, but he had not been in Greece.”

“It is clear that some time has elapsed since this Harold established these relations with the girl — some weeks at any rate — since the brother in Greece has had time to hear of it and come across.”

“A carriage heavily loaded with luggage has passed out during the last hour.”
“You may have observed the same wheel-tracks going the other way. But the outward-bound ones were very much deeper — so much so that we can say for a certainty that there was a very considerable weight on the carriage.”