of Edinburgh, Session 1881-82. 
615 
amount of simple drying will then make the insulation good. That 
the fault did not lie in the jar itself I have tested since my return 
to this country, for I find that here the leakage is less than 1*5 
per cent, per diem, while in Madras it was often over 30 per cent, 
per diem. 
On account of these difficulties, I was unable to make any long 
series of observations, but in July of last year (1881) I made a 
few, that were specially interesting as being the only ones in which 
'I have observed negative electrification in Madras, except during 
thunderstorms. 
The observations were as follows : — 
July 
5 1 P.M. 
6 
7 
7 2.20 
Strong land wind, 
5 ? 
Reading. 
Temp. 94° F, -74 \ In each case 
, , -16/ there were local 
, , of showers within 
,, - 15 j 3 or 4 hours. 
These observations are, of course, too few to found any theory 
upon, but those who are acquainted with the peculiar sensations 
produced by the land wind in Madras, will feel that the point is 
worth investigation, and I hope on my return to Madras to be able 
to take with me improved apparatus, with which to continue the 
observations. 
3. Eecent Tests of Swan’s Lamp for Fall of Eesistance, with 
increase of Electromotive Force, and Eatio of Candle- 
power to Work expended. By Mr. A. Jamieson. Com- 
municated by Professor Chrystal. 
4. Communication of Preliminary Observations made by the 
Committee appointed by the Highland and Agricultural 
Society to investigate the Mature and Causes of the 
Sheep Diseases known as Louping-ill and Braxy. 
The two diseases have been long known in Scotland, and are the 
cause of serious loss to stock owners. Well-informed breeders have 
estimated the loss at not less than half a million sterling annually. 
