PREFACE TO THE SECOND VOLUME. 



1 N the Advertisement to the Seventh Part of the Scientific 

 Memoirs the Editor has already acknowledged the assistance 

 afforded to the work by the British Association for the Ad- 

 vancement of Science, concurring, as it has done most efficiently, 

 with the other public bodies and individuals by whom the suc- 

 cess of the undertaking had been promoted. It is now his 

 pleasing duty to state, that the support thus given having af- 

 forded an opportunity for the plan and objects of the work to 

 become more generally known, the sale has been so far increased 

 as to give an improved prospect of its permanence; and that a 

 portion of the Third Volume is already in the press. 



Of the Memoirs contained in Part VIII. the following have 

 been received from the Committee of the British Association for 

 procuring the translation and publication of Foreign Scientific 

 Memoirs, viz. ; — 



The Galvanic Circuit investigated Mathematically. By Dr. 

 G. S. Ohm. Continuation. 



Bessel on the Barometrical Measurement of Heights. 



RuDBERG on the Expansion of Dry Air. 



Weber on a Transportable Magnetometer. With a Plate. 



Weber on the Magnetic Term-Observations for 1839 of the 

 German Magnetic Association. Extract. With a Plate. 



GoLDscHMiDT On the Observations ^f Magnetic Declina- 

 tion at Gottingen. 

 The continuation of the translation of Ohm's Memoir has 



