458 Prof. C. Michie Smith on 



fact, until nearly a fortnight after the last negative reading 

 was observed. The readings in April and the first half of 

 May were all normal ; and during the next two months 

 absence from Madras prevented me from continuing the 

 observations, which were not renewed till July 14. Between 

 the 14th and 31st of July the readings were negative on 

 seven days. On only one of these days did any rain fall at 

 the place of observation, and then only 0*04 inch fell some 

 eight hours after. In each case the wind was westerly, and 

 in most cases raised great clouds of dust. 



During August negative readings were obtained on nine 

 days, and on none of these could the negative potential be 

 traced to storms at or near the place of observation. On 

 August 1, for instance, the readings were negative from 

 11 A.M. to 2 p.m., and no rain fell till 4 P.M. on the 2nd ; on 

 the 28th they were negative from noon to 5 p.m., ranging 

 from 8 to 467 divisions (say 37 to 2140 volts), and no rain 

 fell till the morning of the 31st. The following table (II.) 

 shows the observations at 10 a.m. 



Table II. 

 Observations at 10 hours M.M.T. August 1884. 





Electro- 



Percentage 



Wind- 



Rain in 







Date. 



meter- 

 readings. 



of satura- 

 tion. 



direction. 



past 24 

 hours. 



Remarks. 











inch. 







1. 



4-27 



85 



s.s.w. 



011 







2. 



-34 



44 



w. 









3. 



-95 



45 



W.N.W. 









4. 



-71 



47 



W.N.W. 









5. 



-12 



56 



W.N.W. 



0-07 j 



Thunderstorm and rain at 

 south of Madras. 



night 



6. 



9 



62 



W. 



0-62 







7. 



4-' 2 



56 



W.N.W. 









8. 



- 3 



56 



W. 









9. 



-26 



50 



N.N.W. 









10. 



-17 



48 



N.W. 









11. 



4-32 



55 



N. 









12. 



4-27 



51 



N.N.W, 









13. 



4-24 



78 



s.w. 



0-59 







14. 



4- 7 



69 



W.N.W. 





Reading —4 at 7 a.m. 





15, 



4-10 



84 



W.S.W. 



l-oi 







16. 



4-66 



79 



W.S.W. 



1-85 







17. 



+30 



68 



W.S.W. 



040 







18. 



? 



77 



W.S.W. 



016 







19. 



4- 6 



61 



W.N.W. 



009 







20. 



? 



62 



W. 



on 







21. 



J 4 



60 



W. 









22. 







68 



W.S.W. 



009 | 



Reading negative at 11 

 and noon. 



A.M. 



23. 



-35 



66 



w. 









24. 



- 9 



58 



w. 









