CONTENTS. XI 



V. — Geodesy and Pendulum Experiments. 



Measuring the Motion of Glaciers. 



Page 



1. Pendulum Observations in Melville Island. (Parry) - - 681 



2. Pendulum Observations in Spitzbergen. (Sabine) - - 682 



3. Pendulum Observations at Port Bowen. (Parry) - - _ 682 



4. Pendulum Observations at Port Foulke. By Dr. Hayes - - 683 



5 . Measurement of a Base Line, and System of Triangulation. By M. 

 Koldewey - - - - - - - - 683 



6. Measurement of the Advance of Glacier in Pranz-Joseph-Piord, East 

 Greenland. By R. Copeland _ . - _ _ 684 



7. Measurement of Glacier near Port Foulke. By Dr. Hayes - - 684 



VI. — Observations on Refraction and on Air. 

 Observations and Experiments on Sound. 



1. Observations and Remarks on Extraordinary Refraction. By Sir John 

 Ross --------- 684 



2. Observations at Port Bowen. By Parry - - _ - 684 



3. Observations on Fog-bows, &c., near Spitzbergen. By Parry - 685 



4. Observations on Refraction. By Scoresby. (Greenland Voyage) - 686 



5. Observations on Mock Moons, &c. By Sir Edward Belcher - 686 



6. Observations of Halos, and Remarks on Twilight. (McClintock) - 687 



7. Remarks on Twilight at Melville Island. (Parry) - - - 687 



8. Analysis and Expansion of Air. (Parry) - - _ - 687 



9. Remarks on the Distance to which Sounds could be heard. (Parry's 

 First Voyage) ---____ 688 



10. Observations on the Velocity of Sound. By Lieutenant Kendall on 688 

 Sir John Franklin's Expedition, 1825-27 - _ - . 689 



11. Experiments on Sound at Winter Island. (Parry) 



12. Experiments on Sound at Port Bowen. (Parry) - - - ggQ 



13. Experiments on the Velocity of Sound. (M. Koldewey) - - 690 



VII. — Terrestral Magnetism. 



1. Magnetic Observations in Davis Strait and Baffin's Bay. By Sir 

 James Ross and Captain Sabine. (Phil. Trans., 1819, and Voyage of 



Sir John Ross in 1818) ----__ 691 



2. Magnetic Observations at Melville Island. By Captain Sabine. 

 (Parry's First Voyage, 1819-20) - - _ _ _ ^92 



3. Magnetic Observations at Winter Island and Igloolik. By Parry. 

 (Second Voyage) - - ----- 693 



4. Magnetic Observations at Port Bowen. By Captain Parry and 

 Lieutenant Foster. 1824-25 ---___ 694 



5. Magnetic Observations at Felix Harbour. By Sir John Ross. 

 Discovery of the Magnetic Pole. By Sir James Ross - - 696 



6. Magnetic Observations at Van Rensselaer. By Dr. Kane - - 697 



7. Magnetic Observations at Port Foulke. By Dr. Hayes - - 698 



8. Comparison of Dip and Horizontal Force at Points in West Green- 



land 



- 699 



9. Hourly Observations of Magnetic Declination at Point Barrow. By 

 Captain Maguire. (Phil. Trans., 1857) - - _ _ 700 



10. Hourly Observations of Magnetic Declination at Port Kennedy 

 (Phil. Trans., 1863) - - - - - - - 702 



11. Magnetic Observations at Sabine Island and other East Greenland 

 Stations. By Captain Koldewey. 1869-70 - - _ _ 793 



12. Methods of determining the Magnetic Elements in the Arctic 

 Regions ------__ 7qk 



13. Magnetic Observations made during the Austro-Hungarian North 

 Polar Expedition to Franz-Joseph-Land. By Lieut. Weyprecht - 709 



14. Magnetic Survey of the North Polar Regions. By Sir Edward 

 Sabine. (Phil. Trans., 1872) - . .^ _x.uwara ^^^ 



