6 THE STUDY OF PLANTS IN ANCIENT AND MODERN TIMES. 
(terminus). With the help of the botanical terminology thus formulated it became 
possible not only to abridge the specific descriptions, but also to recognize species 
from such descriptions, and to determine what name had been given them by 
botanists, and to what group they belonged. 
Linnzus selected as a basis of classification in the “System” established by him 
the characteristics of the various parts of the flower. In this system the number, 
relative length, cohesion, and disposition of the stamens formed the ground of 
division into “Classes” Within each Class, “Orders” were then differentiated 
according to the nature of the pistil, especially the number of styles; and each 
Order was again subdivided into more narrowly defined groups, which received 
the name of “Genera.” To the 23 classes of Flowering Plants (Phanerogamia) 
Linneas added as a 24th Class Flowerless Plants (Cryptogamia), which were 
divided into several groups (Ferns, Mosses, Alge, and Fungi) in respect of their 
general appearance and mode of occurrence. 
This system took immediate possession of the civilized world. Englishmen, 
Germans, and Italians now worked in unison as faithful disciples of Linnzeus. 
Even laymen studied the Linnzean botany with enthusiasm; and it was recommended, 
especially to ladies, as a harmless pastime, not overtaxing to the mind. In France 
Rousseau delivered lectures on botany to a circle of educated ladies; whilst even 
Goethe experienced a strong attraction to the “loveliest of the sciences,” as botany 
was called in that day. Linnzus had introduced for the first time the name 
“flora” to signify a catalogue of the plants of a more or less circumscribed district. 
He had himself written a flora of Lapland and Sweden, and by doing so had 
stimulated others to undertake the compilation of similar catalogues; so that by 
the end of the 18th century floras of England, Piedmont, Carniola, Austria, &e., 
had been produced. By this means a certain perfection was attained in that field 
of botany which has only in view the examination of the fully-developed external 
forms of plants, together with the distinguishing, describing, naming, and grouping 
them, and the enumeration of species indigenous to particular regions. Later on, 
unfortunately, botanists lost themselves in a maze of dull systematizing. They 
either contented themselves with collecting, preparing, and arranging herbaria, or 
else devoted their energies to endless debates over such questions, for instance, as 
whether a plant, that some author had distinguished from others and described, 
deserved to rank as a species, or should be reckoned as a variety dependent on its 
habitat or on local conditions of temperature, light, and moisture. They took delight 
in now including a group of forms as varieties of a single species, now dividing 
some species as described by a particular author into several other species. For 
this purpose they did not rely upon the only sure method, the determination by 
cultural experiment of the fact of the constancy or variability of the form in 
question; nor did they, in general, adhere to any consistent principle to guide them 
in this amusement. 
Aberrations of this kind constituted, however, no serious barrier to progress. 
On the contrary, the passion for collecting continued to extend its range. The 
