452 
CLASSIFICATION OF PLANTS. 
with quick lime, and this repeated as often as rain or wind beats it 
off and the fly re-appears. 
11. That in places which suit, and in seasons particularly dry, 
watering by a watering machine be resorted to. 
Under these precautions, the Committee confidently trust, that the 
loss of crop from the turnip fly, may he, in most cases, prevented. 
I 
The whole concludes with an appendix containing the analysis of 
the returns of each of the 102 correspondents. 
The Committee request any Gentleman who may have made any 
observations on the turnip fly to communicate with them through 
their Secretary, Robt. Baxter, Esq. 
The Report, we think, is of immense importance to farmers in gen¬ 
eral, for although the Natural History of the insect is still in a 
great measure left in obscurity, yet many things are brought toge¬ 
ther which in a little time may be the means of leading to the most 
important results. At all events, the observations recorded in this 
pamphlet go much further than any thing of the kind ever before 
published. 
NATURAL HISTORY. 
ARTICLE XL—A FEW REMARKS ON THE STRUCTURE, DISTRIBU¬ 
TION, CLASSIFICATION AND UTILITY OF PLANTS; 
Being the Substance of Four Lectures delivered before the Sheffield Literary and 
Philosophical Society. 
BY G. T. BURNET, ESQ, PROFESSOR OF BOTANY, KING’S COLLEGE, LONDON. 
Plants are scarcely separable from animals, no absolute character 
being yet known by which they may be distinguished from each 
other with certainty. One great cause of disparagement to the study 
of this delightful branch of Natural Philosophy has hitherto been to 
the unlearned, the alarming prospect of having to learn such a nu¬ 
merous assemblage of hard names; and to the learned, the common 
error of resting in the attainment of the nomenclature, as if the end 
of the science was merely or chiefly knowing the class and order to 
