348 TRANSACTIONS OF SECTION A. 



expect. The effect _ would be fairly permanent, as is observed in spectro-helio- 

 grams, for the detail of the spectro-heliogram is so large that a continually shift- 

 ing set of masses of vapour would give on the average a similar double reversal 

 until a change of distribution through an enormous volume of the sun's material 

 had taken place. This suggestion is put forward as a possible cause of some of 

 the phenomena observed in spectro-heliograms, which are difficult of interpreta- 

 tion on the more generally accepted theory. 



4. The Use of Diagrams in the Classification of Climates. 

 By Dr. John Ball and J. I. Craig. 



5. Note on an Unusual Type of Meteor observed at Portsmouth, 

 August 31, 1911. By F. J. M. Stratton. 



The author described the path of a meteor (observed from the end of the 

 pier) moving slowly from the zenith towards the north. The shape of the path 

 (a letter J with arms of 15°, 1£°, 3° approximately) was probably due to fore- 

 shortening, accompanied by a slight swervo. The swerve might be traced to 

 spin and resistance, or to unequal heating effects. 



6. Report of the Committee on Electrical Standards. — See Reports, p. 80. 



