INTRODUCTION. v 
microscope can render accessible to our visual organs,—and 
comprehending all the phenomena in the boundless Uni- 
verse, which the powers of the telescope can reveal. 
And as no branch of natural philosophy can more strongly 
impress the mind with that deep sense of humility and 
dependence, which the contemplation of the works of the 
Eternal is calculated to inspire, so none can more power- 
fully encourage our aspirations after truth and wisdom. 
Every walk we take offers subjects for profound meditation, 
—every pebble that attracts our notice, matter for serious 
reflection ; and contemplating the incessant dissolution and 
_ renovation which are taking place around us in the organic 
and inorganic kingdoms of nature, we are struck with the 
force and beauty of the exclamation of the poet— 
“ My heart is awed within me, when I think 
Of the great miracle which still goes on 
In silence round me—the perpetual work 
Of Tuy Creation, finished, yet renewed 
For ever! 
