Hehad a sweet and generous nature, and yet was always blundering; a real feelingfor what was beautiful and the capacity to create only what was commonplace; apeculiar delicacy of sentiment and gross manners. He could exercise tact whendealing with the affairs of others, but none when dealing with his own. What acruel practical joke old Nature played when she flung so many contradictoryelements together, and left the man face to face with the perplexingcallousness of the universe.
请教老师：but none when dealing with his own. - 这里的none应该是代词吧？问题是具体是怎么样指代的？
这里的none= but he could not exercise tact 吗？
这里是不是可用not或no, 即but not/nowhen dealing with his own 呢？
He could exercise tact when dealing with theaffairs of others, but none when dealing with his own.
= He could exercise tact when dealing with theaffairs of others, but he could exercise none when dealing with his own.
None=none of it, it指代tact.
