i>92 NATURAL THEOLOG-Y. 



already know, and always possessing many of the same 

 genera] properties. We never get among such original, oi 

 totally different modes of existence, as to indicate that we 

 are come into the province of a different Creator, or under 

 the direction of a different will. In truth, the same order 

 of things attends us wherever we go. The elements act 

 upon one another, electricity operates, the tides rise and fall, 

 the magnetic needle elects its position in one region of the 

 earth and sea as well as in another. One atmosphere in- 

 vests all parts of the globe, and coimects all ; one sun illu- 

 minates, one moon exerts its specific attraction upon all parts. 

 If there be a variety in natural effects, as, for example, in 

 the tides of different seas, that very variety is the result of 

 the same cause acting under different circumstances. In 

 many cases this is proved ; in all, is probable. 



The inspection and comparison of living foi-ms add to 

 this argument examples without number. Of all large ter- 

 restrial animals, the structure is very much alike ; their 

 senses nearly the same ; their natural functions and passions 

 nearly the same ; their viscera nearly the same, both in 

 substance, shape, and office ; digestion, nutrition, circulation, 

 secretion go on in a similar manner in all ; the great circu- 

 lating fluid is the same, for I think no difference has been 

 discovered in the properties of blood, from whatever animal 

 it be drawn. The experiment of transfusion proves that thp 

 blood of one animal will serve for another. The skeletoni 

 also of the larger terrestrial animals show particular vane 

 ties, but still under a great general affinity. The resem- 

 blance is somewhat less, yet sufficiently evident, between 

 quadrupeds and birds. They are all alike in five respects, 

 for one in which they difler. 



In fish, which belong to anothei department as it weie 

 of nature, the points of comparison become fewer. But Ave 

 never lose sight of our analogy : for example, we still meet 

 with a stomach, a liver, a spine ; with bile and blood ; A\dth 

 teeth ; with eyes — which eyes are only slightly varied froni 



