Rejoinder of Mr. Quinby on Crank Motion. 357 



A list of errata, forwarded by the author to me, is as fol- 

 lows: page 124, line 5 from bottom, for circle "ucZG," 



FXrad 

 read circle vlGw; page 126, line 4 from top, for " ^"^ 



P X rod 

 =Cc," read v,xCc. Page 126, 1. 13 from top, for 



"But Cerf," read But Ce. Page 126, 1. 14 from top, for 

 " am : aS :: Cc : CS and dn : dt, (or aS,) :: Ce : Ct," read 

 am : Ce :: «S : CS and dn : Cc :: dt, (or aS,) : C*. Page 126, 

 1. 1 1 from bottom, for " refutation," read repetition. I would 

 have sent you these notices earlier, but it has been out of my 

 power, &.c.' 



From the part of your letter which I have quoted, it will 

 be seen, 1st, that my reply was written a month, (and had 

 been in your hands two weeks,) before I received the com- 

 munication alluded to ; and 2nd, that in no part of the com- 

 munication is it intimated, that it was made at the request, or 

 with the knowledge of the writer of the ' examination.' The 

 next thing which it is proper to state to the public, is, the 

 manner or view in which I received this communication, 

 and the answer I returned to the suggestions which your 

 mathematical friend and yourself had made. I received the 

 communication as the voluntary offering of the Editor 

 of the American Journal of Science and Arts, in a pri- 

 vate correspondence. The answer I returned was, that I 

 thought that the error in question was not of that class which 

 is properly denominated errata. I gave my reason for this 

 opinion, and declined making the alteration in my reply, 

 which your friend and yourself had suggested. I also stated, 

 (on this point I write from memory,) that if the error in ques- 

 tion were of that class which is properly denominated errata, 

 I still could not see that I was bound to treat it as your friend 

 and yourself had proposed — the usual course in such cases 

 being for each writer to correct his own errata. In conclud- 

 ing my answer, however, I gave you a note, which I request- 

 ed might be added at the bottom of a suitable page, of my 

 reply. This was done. 



I have now stated all the facts, (at least all that are known 

 to me,) relative to the communication to which the writer of 

 the ' examination' has alluded, and without offering any 

 comment, and with but one remark, I will submit it to the 

 public to judge whether 1 was bound to treat the error in 

 question differently from what I did or not. 



