42 TREATMENT OF THE SUBJECT-MATTER. 
ducts which are furnished by one and the same plant. The 
advantages of such a classification are greater than the disad- 
vantage, which may be supposed to arise from the fact that by 
this arrangement things are found in close association which are 
not connected either morphologically or medicinally. The 
‘* Pharmacographia,” subsequently mentioned, as also the 
**Grundriss der Pharmacognosie” of one of the authors‘ (F.), 
presents the drugs of the vegetable kingdom arranged in accord- 
ance with the natural families of plants, while the “‘ Pharma- 
cognosie des Pflanzenreiches” (by F. A. Fliickiger) bases its 
classification more upon the external characters of the drugs. 
An excellent example of chemical classification is presented by 
Falck’s ‘‘ Uebersicht der speciellen Drogenkunde,” Berlin, 1883, 
Dp. 57. 
‘The ‘‘Grundriss” adheres to the well-planned system of the ‘‘ Sylla- 
bus der Vorlesungen iiber specielle und medicinisch-pharmaceutische 
Botanik,” by Eichler, third edition, Berlin, 1883, p. 54. 
