But the bed I made up for myself was sufficiently uncomfortable to giveme a wakeful night, and I thought a good deal of what the unlucky Dutchman hadtold me. I was not so much puzzled by Blanche Stroeve's action, for I saw inthat merely the result of a physical appeal. I do not suppose she had everreally cared for her husband, and what I had taken for love was no more thanthe feminine response to caresses and comfort which in the minds of most womenpasses for it. It is a passive feeling capable of being roused for any object,as the vine can grow on any tree; and the wisdom of the world recognises itsstrength when it urges a girl to marry the man who wants her with the assurancethat love will follow. It is an emotion made up of the satisfaction insecurity, pride of property, the pleasure of being desired, the gratificationof a household, and it is only by anamiable vanity that women ascribe to it spiritual value. It is an emotionwhich is defenceless against passion. I suspected that Blanche Stroeve'sviolent dislike of Strickland had in it from the beginning a vague element ofsexual attraction.
请教老师：上面节选中，这一句 and it is only by an amiable vanity that womenascribe to it spiritual value. 中的by和that如何剖析？
另外，...had in it中的it是指的an emotion吧？
It is only by an amiable vanity that women ascribe to it spiritualvalue.
这是一个强调句型。不强调的句式为：
Women ascribe to it spiritual value by an amiable vanity. by介词短语为方法状语。
in it 中的it 指代主语dislike。
