40 J. H. MAIDEN. 



Explanation of Plate. 

 Plate 1 — Composite log of White Gum and Stringybark. 

 The line of demarcation between the smooth bark of the 

 White Gum and the fibrous bark of the Stringybark is 

 evident ; the letter A has been repeated four times to 

 roughly show the line of demarcation of the two woods, 

 which is very evident in the original or in a coloured 

 drawing. 



Plate 2 — The dark coloured stem of an Apple-tree (Ango- 

 phora) growing out of the smoother, paler trunk of a Swamp 

 Gum (Eucalyptus tereticornls). [C. T. Musson, photo.] 



POSSIBLE RELATION BETWEEN SUNSPOTS AND 



VOLCANIC AND SEISMIC PHENOMENA 



AND CLIMATE. 



By H. I. Jensen, b.sc, Junior Demonstrator in Chemistry 



and Geology, University of Sydney. 

 (Communicated by Prof. T. W. E. David, b.a., f.r.s., etc.) 



[Read before the Royal Society of N. S. Wales, June 1, 1904.~\ 



Part I — Possible Relations between Sunspots, Earth- 

 quakes and Volcanic Eruptions. 



SYNOPSIS ; 

 I. Introduction. 

 II. Causes of Earthquakes. 



III. Sedimentation. 



IV. Volcanoes. 



V. Sunspot Minima and Earthquakes and Eruptions. 



VI. Seismic and Volcanic Activity and Lunar Influences. 



VII. Evidence afforded by the Earthquakes of Japan. 



VIII. Summary of Results. 



I. Introduction, — The present paper is a sequel to my 

 note communicated to this Society on June 4th, 1902 



