318 EIGHTH REPORT — 1838. 



Dr. Carson stated, that owing to the small number of cases 

 of lung disease in animals which had occurred in-the Zoological 

 Gardens of Liverpool in the winter of 1837-8, the Committee 

 on that subject had not been enabled to make a report to the 

 Newcastle Meeting, but intended to do so at the Birmingham 

 Meeting. 



Appendix to a Report on the Variatioiis of the Magnetic In- 

 tensity (printed in vol. vi.). By Major E. Sabine, F.R.S., 



In reference to the report on the Variations of the Magnetic 

 Intensity, wliich the British Association have done me the ho- 

 nour to print in their last volume, I wish to communicate tiie 

 results of the observations made by Captain Duperrey in his 

 voyage of circumnavigation in the Coquille, in 1822 — 1825, 

 which I have received in a private communication from that 

 distinguished officer and magnetic observer. The Section will 

 learn with pleasure the satisfactory accord of these observa- 

 tions with those of Captains De Freycinet and Fitz Roy, pub- 

 lished in my report. When in compliance with the wishes of 

 the Association, I first entertained the purpose of collecting in 

 one body the observations of intensity made by different ob- 

 servers in all parts of the globe, so far as they are comparable 

 with each other, one of my first steps was to write to Captain 

 Duperrey to solicit the communication of any intensity results 

 which he might have obtained. I find, by the letter which I 

 have received, that Captain Duperrey did kindly comply with 

 my request ; but, unfortunately, the packet which must have 

 contained the particulars of his observations has never reached, 

 me. The letter which I have received contains a notice, both 

 of the results he obtained, and of the mode in which they were 

 observed. Had I possessed this information at the time my 

 report was printed, I should on every account have rejoiced to 

 have embodied it in the report : and I am anxious to avail my- 

 self of this opportunity of doing what may yet be done to sup- 

 ply the omission. Captain Duperrey's observations were made 

 with a horizontal needle, which, from accidental circumstances, 

 was not observed with prior to his departure from France. 

 The usual test of the permanency of the magnetism of the 

 needle, viz. its vibration at the same station, at the commence- 

 ment and at the close of the series, was, therefore, omitted in 

 this case. In the absence of this, which is the most conclusive 

 test, Captain Duperrey has estimated the loss which his needle 



