H. W. Dove on the Law of Storms. 369 



angle, and at the time grows wider and wider as it pro- 

 gresses. ' 



The phenomena of storms south of the equator may easily 

 be inferred from what has been said above of the opposite 

 hemisphere. The rectilinear course within the tropics, the 

 sudden curvature at the limits of the tropics and the tem- 

 perate zones, the accompanying expansion of the whirls con- 

 stituting the storm ; in a word, all the essential phenomena 

 of storms, must clearly be the same for one hemisphere as for 

 the other, with the sole exception, that in the one (the northern) 

 the rotation is after the order of the letters S. E. N. W., and 

 in the other (the southern) after the order of the letters 

 S. W. N. E. 



I take this opportunity to make, in my own vindication, a 

 few remarks upon the manner in which my labours in this 

 field have been brought under the notice of the English public. 

 In the Lond. and Edinb. Phil. Mag., vol. xi. p. 390, a paper 

 by Mr. Dalton has appeared, in which I am directly charged 

 with claiming for myself a theory which he had already 

 many years before made known, and which had still earlier 

 been promulgated by the celebrated Hadley. Upon a dili- 

 gent perusal of Mr. Dalton's Meteorological Essays and Ob- 

 servations, and of Hadley's original Memoir (The Cause of 

 the general Trade-wind, Phil. Trans. 1735, p. 58), I have 

 not succeeded in finding a single trace of, or bare allusion to, 

 the existence of the law of rotation, which it was the principal 

 object of my paper to establish by observations, and explain 

 upon theoretical principles. And if your readers or Mr. 

 Dalton should do me the honour to look into my Meteorolo- 

 gical Essays, Berlin, 1837-38, pp. 244-250, it will be seen, 

 that so far from attempting to usurp the credit so justly due 

 to Hadley for the fundamental idea, upon which my own 

 theory is founded, and which he had himself so successfully 

 applied to the particular problem of the trade-winds, I have 

 been anxious to acknowledge the full extent of my obligations 

 to him, and to bring his merits as a discoverer prominently 

 forward. 



In an article upon Lieut.- Colonel Reid's law of storms in 

 the Edinburgh Review, I find my meteorological researches 

 again alluded to, but upon a distinct ground. The anony- 

 mous Reviewer, in his patriotic anxiety to satisfy his readers 

 of the purely British growth of this theory, allows that some 

 remarkable passages upon the subject had previously ap- 

 peared in the memoirs of the Berlin Professor, but 'that these 

 are mere ingenious speculations, for they are no more. The 

 term passage, for a memoir (on barometric minima) of seven- 



Phil. Mag. S. 3. Vol. 17. No. Ill, Novi 1840. 2 B 



