I should say that the useful results of science had accumulated, but that there had been no accumulation of knowledge, strictly speaking, for posterity; for knowledge is to be acquired only by a corresponding experience.  How can we know what we are told merely?  Each man can interpret another’s experience only by his own.  We read that Newton discovered the law of gravitation, but how many who have heard of his famous discovery have recognized the same truth that he did?  It may be not one.  The revelation which was then made to him has not been superseded by the revelation made to any successor.

     We see the planet fall,
     And that is all.

In a review of Sir James Clark Ross’s Antarctic Voyage of Discovery, there is a passage which shows how far a body of men are commonly impressed by an object of sublimity, and which is also a good instance of the step from the sublime to the ridiculous.  After describing the discovery of the Antarctic Continent, at first seen a hundred miles distant over fields of ice,—­stupendous ranges of mountains from seven and eight to twelve and fourteen thousand feet high, covered with eternal snow and ice, in solitary and inaccessible grandeur, at one time the weather being beautifully clear, and the sun shining on the icy landscape; a continent whose islands only are accessible, and these exhibited “not the smallest trace of vegetation,” only in a few places the rocks protruding through their icy covering, to convince the beholder that land formed the nucleus, and that it was not an iceberg;—­the practical British reviewer proceeds thus, sticking to his last, “On the 22d of January, afternoon, the Expedition made the latitude of 74 degrees 20’ and by 7h P.M., having ground (ground! where did they get ground?) to believe that they were then in a higher southern latitude than had been attained by that enterprising seaman, the late Captain James Weddel, and therefore higher than all their predecessors, an extra allowance of grog was issued to the crews as a reward for their perseverance.”

Let not us sailors of late centuries take upon ourselves any airs on account of our Newtons and our Cuviers; we deserve an extra allowance of grog only.

We endeavored in vain to persuade the wind to blow through the long corridor of the canal, which is here cut straight through the woods, and were obliged to resort to our old expedient of drawing by a cord.  When we reached the Concord, we were forced to row once more in good earnest, with neither wind nor current in our favor, but by this time the rawness of the day had disappeared, and we experienced the warmth of a summer afternoon.  This change in the weather was favorable to our contemplative mood, and disposed us to dream yet deeper at our oars, while we floated in imagination farther down the stream of time, as we had floated down the stream of the Merrimack, to poets of a milder period than had engaged us in the morning.  Chelmsford and Billerica appeared like old English towns, compared with Merrimack and Nashua, and many generations of civil poets might have lived and sung here.