How are your absent cousins to understand the tenour of your life in Bath without one?

你不在的堂兄弟如何理解你在巴斯的生活？

Whether natural selection has really thus acted in adapting the various forms of life to their several conditions and stations, must be judged by the general tenour and balance of evidence given in the following chapters.

自然选择是否真的因此使各种生命形式适应它们的不同条件和地位，必须根据以下各章中给出的证据的一般基调和平衡来判断。