180 



critical genera as Eugenia, Ficus, Quercus, Piper, Begonia, etc. 

 With some graphic representation of the type, even if only of a 

 single leaf, a far more accurate conception of the species can be 

 secured than by a most critical study of the description alone. 

 Certain considerations are essential to success in making 

 carbon leaf impressions. In the first place the paper selected 

 should be of good quality, thin but firm, slightly rough in finish. 



Fig. 3. Leucosyke capitella Wedd. 



and not glazed. The carbon paper should be of medium hard- 

 ness; if too hard it is difificult to make clear impressions, and if 

 too soft the finished impression is apt to rub or smudge too easily. 

 A clearer impression will usually result if the finger used in 

 rubbing be first wrapped with a single thickness of a linen or 

 cotton handkerchief, or with a small piece of cotton cloth, the 

 slightly rough surface of the cloth on rubbing over the paper 

 giving a sharper impression than will the naked finger. Like- 



