As far as the third factor is concerned,the history of science shows many instances in which the force of authority has operated in such a manner as to build up an exceedingly powerful resistance to further investigation;in some cases centuries elaps

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As far as the third factor is concerned,the history of science shows many instances in which the force of authority has operated in such a manner as to build up an exceedingly powerful resistance to further investigation;in some cases centuries elapsed before this resistance was eventually broken down,as happened in cosmology,for example.
针对上面这句话,有个in which the force.,这个which前加的in是有什么用呢,请指教

个人认为即使不加in,也正确,那么后面的从句就是关于instances的定语从句.加了In,就是说,从以往学术发展的历史来看有很多例子是关于.,in在这里是关于的意思,那么这成了状语从句.