358 Mr. Barnes's Reclamation of Unios. 



The terms of the propositions that are in the 'examina- 

 tion,' require to be taken both alternately and in cross or- 

 der :* the author, in his correction, has written them in cross 

 order. The error cannot, therefore, be considered accidental. 



In concluding this rejoinder I will inform the author of 

 the ' examination 1 that there is no other part of his ' answer' 

 which I deem it important to notice. I have never possessed 

 the hope that I should be able to convince him of the truth 

 of my demonstration, or of the errors in his; and I have nei- 

 ther time nor inclination, to pursue a controversy which I 

 think can never convince my antagonist, or afford benefit to 

 the public. My reasoning on the crank problem is given in 

 my demonstration : and the public have the means of judg- 

 ing whether there is, or is not a loss of power. 



I will add one remark to the public, and take my leave of 

 the crank problem forever. There is at this time an amount 

 of power passed through the crank, to various appended ma- 

 chinery, equal to the labor, daily, of half a million of men. If 

 therefore, it would be important tq know whether the labor 

 of half a million of men be efficiently applied, it is equally im- 

 portant to know whether there is or is not a loss of power, oc- 

 casioned by the crank. A. B. Quinby. 



Sept. 6, 1827. 



The private communication to Mr. Q,uinby was made at 

 the request of the author. — Editor. 



Art. XIII. — Mr. Barnes's Reclamation of Unios. 



(Read before the Lyceum.) 

 TO PROFESSOR SILLIMAN. 



New York, Nov. 12, 1827. 



Dear Sir — In looking over the continuation of Humboldt 

 and Bonpland's Zoological Observations, just received, I ob- 

 serve, that a portion of that splendid work is devoted to 



* When I wrote the note, (which was written without having the ' examina- 

 tion' or the communication alluded to before me,) I did not perceive that the 

 terms required also to be taken in cress order. 



