The Nature Library 



to the students of biology, but the unprofessional students want 

 (but little of all this, I know a young woman who took a post- 

 graduate course in biology at a noted summer school, and the 

 one thing she learned was that certain bacilli were found only 

 in the aqueous humor of the eyes of white mice. The world 

 is full of curious facts like that, that have no human interest 

 or educational value whatever. 



If one could number all the trees of the forest and all the 

 leaves upon the trees, what would it profit him? To know 

 the different kinds of trees when you see them, and the func- 

 tion of the leaves upon them that were more worth while. 

 I have read studies of leaves that were just as profitless as to 

 know their numbers. I have heard discourses upon the changes 

 in the plumage of certain water-fowl from youth to age, and 

 from one moult to another, that were as profitless and weari- 

 some as studying the variations of the leaves or their numbers* 

 i I hardly know why I am impatient when people come to me 

 ;with their hands full of different leaves and ask me what 

 tree is this from, and this, and this? If your business is not 

 jvith trees, if you live in the city and care mainly for city things, 

 why bother about the trees, unless for the pleasure of it during 

 your summer excursions into the country; and if it affords you 

 pleasure, you will not want any one to tell you: you will want 

 to identify the trees themselves. 



I [The same with the birds, [The main profit of this branch" of 

 natural history is in the pursuit not in the name, but in the bird 

 It is the chase that allures the sportsman, and it is the chase that 

 profits the nature-student Did you ever receive a gift of brook- 

 trout by express? How pitiful they look stale fish onl! But 

 the trout you brought in at night after threading for miles the 

 mountain stream: its voice all day in your ears; its sparkle all day 

 in your eyes; the love of its beauty and purity all day in your 

 heart; wading through be^-balm or jewel-weed; skirting wild 

 pastures; starting the grouse or the woodcock with their young; 

 surprising bird and beast at their home occupations these were 

 trout with a flavor* 



JVhatever opens up new doors or windows for us into the 

 k world about us, whatever widens the field of our interests and 

 sympathies, has some sort of value moral, intellectual, or 

 fcsthgtic* Bu$ much of the so-called nature-study opens no new; 



xiv / 



