108 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



Professor Nipher lias prosecuted the magnetic survey of 

 Missouri during li is summer vacation. 



A very complete catalogue of papers and books on elec- 

 tricity and magnetism (being the catalogue of the late Sir 

 Francis Ronalds) is being published by the Society of Tele- 

 graph Engineers. 



The magnetic observations made by Secchi at Rome, in 

 1877, are published in full in the Met. Italiana. They were 

 made eight times by day throughout the year, and embrace 

 observations of the declinometer, and both horizontal and 

 vertical force. 



Sir Edward Sabine's fifteenth and last contribution to ter- 

 restrial magnetism, although presented to the Royal Society 

 in 1876, has but lately come to hand, and completes his mag- 

 netic survey of the globe. The present number (XV.) em- 

 braces four zones, each ten degrees in breadth, from the 

 equator to forty degrees south latitude, and gives for each 

 zone the magnetic declination, inclination, and force, both in 

 tabular form and upon charts, the mean epoch being from 

 1840-45. A table is also appended as in the preceding 

 Memoirs, giving a comparison between Sabine's collection 

 of observed data and the theory and tables of Gauss and 

 Weber. 



The Comparative Study of Observations on the Magnetic 

 Needle and on Solar Spots forms a memoir, by Spec, in the 

 Bulletin of the Belgian Academy. The author infers a very 

 intimate connection between these phenomena. 



Balfour Stewart has communicated to the Royal Society" 

 a memoir on the Variations of the Diurnal Ran ore of the 

 Magnetic Declination, as recorded at the Prague Observa- 

 tory since July, 1839. lie finds a persistent agreement be- 

 tween the times of sun-spot maximum and the variations of 

 the magnetic needle. 



CD 



On the Decennial Period in the Mean Amplitude of the Di- 

 urnal Oscillation and Disturbance of the Magnetic Needle and 

 of the Sun-spot Area, an abstract of a paper by J. A. Broun 

 is published in the Proceedings of the Royal Society at 

 Edinburgh. In this paper, the author determines the epochs 

 of maximum and minimum range of the diurnal oscillations 

 of the magnetic needle. The author concludes that the in- 



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crease of the diurnal variation is not due to a different cause 



