J.B.Watson reduced thinking to inhibited speech located in the minute movements or tensions of the physiological mechanisms involved in speaking; and although Ryle is careful to point out that there are many senses in which a person is said to think and in which words are not in evidence, he has also said that saying something in a specific frame of mind is thinking a thought.

这个句子里两个in which是句子的什么成份？分别代表什么？in evidence在该句子里是什么意思？