On the Dying Struggle of the Dichotomous System. 431 



ing great advantage from the use ofcevtain improvements, and 

 we might be content to keep this knowledge to ourselves. 



We are not the manufacturers of the engines, but the pur- 

 chasers of them ; we have no monoply to maintain, or any other 

 advantage to enjoy, but what may be shared by every indivi- 

 dual who may wish to employ similar machines ; but we do 

 feel it to be an act of justice to those ingenious men, by whose 

 labours we have benefited, to bear testimony to the success of 

 their efforts : and as, since the time of Boulton and Watt, no 

 one who has improved our engines has reaped pecuniary re- 

 ward, it is at least fair that they should have credit for their 

 skill and exertion. We are not the partisans of any indivi- 

 dual artist, we avail ourselves of the assistance of many ; and 

 the great scale upon which we have to experiment, makes the 

 result most interesting to us. 



In the last year, besides many smaller engines for winding 

 and stamping, the mines in which I am interested in Corn- 

 wall and Wales, employed 25 steam-engines for pumping, of 

 which 17 have cylinders from 60 to 90 inches in diameter: 

 their consumption of coal was 495,434 bushels ; and a due re- 

 gard to the oeconomy of the application of so vast a power is 

 sufficient to interest me in every thing by which it may be 

 promoted. 



London, May 25, 1830. JoHN TayLOR. 



LXII. Oti the Dying Struggle of the Dichotomous System. By 

 W. S. MacLeay, Esq. M. A. In a Letter to N. A. Vigors, 

 Esq. F.R.S.* 



My Dear Vigors, 



SOME years have now elapsed since a gentleman, the sable 

 hue of whose vesture, if not the smile on his countenance, 

 betokened that he should be in peace with all men, came up 

 from the North to London, and announced himself to me as 

 the Rev. John Fleming, D.D., Minister of Flisk, N. B. Con- 

 sidering him to be entitled to my services, as being a labourer 

 in the same vineyard with myself, I of course showed him all 

 the attention in my power. I knew him indeed at the time 

 only by two or three articles in the Supplement to the Ency- 

 clopai'dia Britannica, which, if they be not fair specimens of a 

 Scotch U.U.'s usual (juantum of Greek, will at least remain a 

 monument of his talent for writing on animals that he not 

 only never saw, but would not even now know if he saw them. 

 In addition to these truly 7iovel specimens of Entomological 



• Coniiminicatcd by N. A. Vigors, Ebtj. 



knowledge, 



