INTRODUCTION. 



11 



" To pace 



The forest's ample round, 

 And see the spangled branches shine, 

 And mark the moss of many a hue 

 That varies the old tree's brown bark 



Or o'er the grey stone spreads." 



Let him try our recipe ; let him look upon nature with the 

 eye of a naturalist, and let him communicate his im- 

 pressions to his brethren in affliction. Were he to subject 

 himself to such a course of mental and physical hygiene, we 

 place his physician and all the potency of the vnateria me- 

 dic a at defiance. The lounger at our sea-coast bathing-places 

 would experience a new delight in his scrambles among the 

 cliffs, were he acquainted with the character or uses of the 

 lichens which crust their surface wdth a grey or yellow coat, 

 for littoral or marine species are possessed of additional in- 

 terest from the circumstance that they include the most valu- 

 able tinctorial species, — whose products are the bases of the 

 Orchil, Cudbear, and Litmus, so familiar to the dyer and che- 

 mist. The tourist, merely in search of fresh air and exercise, 

 or of that equally vague entity denominated scenery, clam- 

 bers upwards of three thousand feet to the summit of Ben 

 Lomond or Ben Nevis, for the purpose of catching a glimpse 

 of sunrise or sunset, or of viewing a certain number of 



