3-i C. PIAZZI SMYTH ON 



APPENDIX IV. 



1. Greenwich Testimonies as to Cosmical Accompaniments of Aurora being deficient 

 on April S, 1882, and April 30, 1883. — Letters 1 and 2. 



Royal Observatory, Greenwich, 

 London, S.E., May 12, 1883. 



Dear Sir, — In regard to unusual phenomena on 1882, April 8, and 1883, April 30, as compared 

 •with adjacent days, I am requested by the Astronomer-Royal to inform you as follows : — 



The magnetical registers (Declination, Horizontal Force, and Vertical Force) indicate nothing 

 unusual, neither do the Meteorological (Barometer, Thermometer, Electrometer). 



Wind 1882, April G to 10, steady EKE and N.E. throughout the greater part of the five days, 

 changing on afternoon of April 10. 



Wind 1883, April 29 to May I. Change on April 30 from K to S.W. at 4 h , and from S.W. 

 to E. at G^ h . On April 29 change in opposite direction about same times. On May 1, steady 

 N.E. wind. 



1882, April 8. Brilliantly fine and cloudless throughout, similar on April 6 and 7, very little 

 cloud on April 9, cloudy but fine on April 10. 



1883, April 30. A very similar day (in all respects) to May 1. 



I am, Dear Sir, 



Yours very truly, 



(Signed) WlLLIAM ELLIS. 



Prof. C. P. Smyth. 



Royal Observatory, Greenwich, 

 London, S.E., May 14, 1883. 



Dear Sir, — With reference to your inquiry as to whether there was anything unusual on the 

 Solar photographs of 1882, April 8, and on 1883, April 30, as compared with photographs taken 

 on neighbouring days, the Astronomer-Royal requests me to say that there are no noteworthy changes 

 in the spots shown on pictures taken on 1882, April 7, 8, and 9. Small spots were constantly 

 forming or disappearing, but nothing unusual is shown. 



The picture taken on 1883, April 30, shows a group of several very small spots which disappeared 

 before 1883, May 1. Two small groups not visible on 1883, April 30, are shown on the picture 

 taken on May 1. The changes are not at all unusual in character or amount. 



I am, Dear Sir, 



Yours very truly, 



(Signed) E. Dun kin. 



Prof. C. Piazzi Smyth. 



2. Of the Aurora said to have been observed at 1 Station out of 24 in Scotland 



on April 8, 1882. 



Letter from the Gordon Castle Observer to Mr Buchan, Secretary Scottish Meteorological Society. 



Dear SIR, — T am in receipt of your note inquiring about "Aurora" entered in my notes of daily 

 readings in 1882. I have looked up the Schedule, and find there are no particulars dated; simply 

 Aurora. The time is too far back to bring my memory to it, but I see by the readings under, that 

 it had been the precursor of a considerable depression of the atmosphere at the period. 



I am, Sir, 



Yours faithfully, 



(Signed) JOHN WEBSTER. 



