So heedful a writer as Henry James,for instance,on occasion

So heedful a writer as Henry James是一个倒装,但我觉得里边省略了一些词,如果按照我们正常的写法的话, 应该是although Henry James is such a heedful writer, he wrote so ungrammatically.句子里边的as 是尽管的意思,相当于although,它作尽管讲时,放在句首必须倒装.for instance, on occasion都先不用管,that后面的句子是a schoolmaster would be justly indignant,而finding such errors in a schoolboy’s essay是一个分句修饰schoolmaster, 意思是说：
比如说,Henry James是一位很小心谨慎的作家,但他写的东西偶尔也不符合语法规则,要是小学老师在学生作文中发现类似的语法错误,生气也是很正常的.