CHAP. v.] Catalogue of Nebula. 187 



kept with the " Eegister of Sweeps." Observations and 

 remarks on various subjects will often be found as memo- 

 randums, made during or at the end of a sweep, to which 

 the general index may serve as a direction as for instance 

 under the head of zodiacal lights the index points out twelve 

 different sweeps in which they were observed. 



N.B. Let it be remembered that the memorandums in 



the transcript of the sweeps between || 1| are mine, and 



must be confided in accordingly. 



At the end of the Catalogue of Nebulae I have put a list 

 of memorandums to the catalogue of omitted stars, and 

 index to Flamsteed's Observations, contained in his second 

 vol. They are properly not all to be called errata, but 

 mem. of errors, which could only be solved by later obser- 

 vations, &c., &c. 



All your father's papers from the Phil. Trans., which are 

 bound in five volumes, and in which I have carried all 

 corrections (in the Catalogues of Nebulae) I could find, I 

 must keep a little longer, but they shall come safe to your 

 hands along with Bode's and Wollaston's catalogues, when 

 my eyes have robbed me of the pleasure of reading for 

 which misfortune I am in daily fear. 



I am, dear nephew, 



Yours affectionately, 



C. HERSCHEL. 



