DIRECTIONS FOR STUDY. xxiii 



with a camel's-hair pencil. Strips of thin, gummed paper 

 should then be fastened over the thicker parts, to' prevent 

 their coming loose in handling. Prepare your glue in an 

 earthen or porcelain-lined vessel, as corrosive sublimate 

 acts on all common metals, and the brush, passing from 

 plant to glue again and again, will be likely to produce 

 stains if there is a trace of metal in the solution. 



The labeling and arranging of plants depend upon 

 their classification. When you know the characters upon 

 which classes are founded, have begun to consider the 

 affinities of plants, and have studied a few natural orders, 

 you may intelligently begin to arrange your plants in their 

 proper order. But, before attempting this, you should be 

 so familiar with the assemblages of characters that plants 

 present, and with their relations to each other, that you at 

 once see why a plant is placed here and not there in your 

 collection. In the Flora you will find a full statement of 

 the characters of each order, followed by those of its lead- 

 ing genera, and of such representative species as will aid 

 in the full comprehension of the principles involved. 



THE USE OF CHARTS. Many of the features of plants 

 are so minute that they are at first difficult to find, and 

 much is gained by consulting beforehand enlarged and 

 colored diagrams showing the botanical characters of the 

 various organs of plants. " Henslow's Botanical Dia- 

 grams," published by the Science and Art Department of 

 the English Educational Council, have a high reputation 

 for their scientific accuracy, their completeness of illustra- 

 tion, their judicious selection of typical specimens, and 

 their skillful arrangement for purposes of education. Wish- 

 ing to furnish pupils with every advantage in this study, 

 the author induced her publishers to incur the very con- 

 siderable expense of publishing a revised and enlarged 

 American edition of the English Charts. In place of the 

 nine English sheets, this set consists of six large charts in 

 which several American plants have been substituted for 



