Bueno (wayno), their word for 'good,' undoubtedly being taken from the Spanish language.

I believe the word "kay" to be Indian.
It means "no", and thus the "Kay bueno" so often used by them means literally "no good," and is a term of reproach On the other hand, "heap bueno" is "very good," their enthusiasm being manifested merely by drawing out the word "heap." In speaking English they appear to have no other way of expressing, in a single phrase, their like or dislike of an object or person.
Without waiting to see whether Viney approved of his method of disciplining her dog, or intended to take his advice regarding its disposal, he wheeled and started off in the direction of the trail which led down the bluff to the Hart ranch.

When he reached the first steep descent, however, he remembered that Pete had spoken of some mail for the Harts, and turned back to get it.
Once more in Hartley, he found that the belated train was making up time, and would be there within an hour; and, since it carried mail from the West, it seemed hardly worthwhile to ride away before its arrival.
Also, Pete intimated that there was a good chance of prevailing upon the dining-car conductor to throw off a chunk of ice.

Grant, therefore, led his horse around into the shade, and made himself comfortable while he waited..