1871.) Proceedings of the Asiatic Society. 75 
Strength of magneto-electric cur- 
Resistance in mills. | rents as indicated by the human 
8. U. body, through the resistance of the 
insulator under test. 
No. of Insulator. 
L 0.11 Strong shocks felt by fingers. 
2. 0.13 Ditto ditto. 
ae 0.145 Ditto ditto. 
4. 0.19 Ditto ditto. 
5. 0.75 Slight shocks felt by fingers, 
6, 2.30 No shocks felt by fingers, but good 
shocks through tongue. 
7. 5.70 No shocks felt by tongue, but a 
strong acid taste. 
8. vial Distinct, but slight acid taste. 
9. 8.2 Ditto ditto. 
10. 82.0 Nothing felt by tongue. 
11. 189.0 Ditto ditto. 
12. 6150 Dittce ditto. 
13. 2520.0 Ditto ditto. 
14. ml Ditto ditto. 
From these experiments it follows that all insulators offering a 
resistance up to about 1 mill. S. U. can be detected by the fingers, 
and those above 1 mill. and under, 8 mills. can be unmistakably de- 
tected by the tongue. It appeared also that tongues of different 
persons were equally sensitive, since several persons, Europeans 
and natives, acknowledged the known acid taste, even through the 
insulator No. 9, having 8.2 mill. 8. U. resistance. 
The highest limit of the method could of course be increased by 
filling the revolving bobbin of the magneto-electric machine with 
much finer wire and increasing the number of permanent magnets ; 
however, this will be scarcely necessary, because it seems to be a 
fact that if an insulator has more than about 8 mills., the resistance 
is generally so high as to be practically infinite and, therefore, a 
