Magnetism, Cohesion, Adhesion and Viscosity. .513 



Amongst the alloys that become neutral by combination, he 

 mentions copper and nickel; now this alloy, which is popu- 

 larly called German silver, I believe, I found to be so mag- 

 netic as to draw the needle after it; but then the proportions 

 of the two alloys most probably differed ; his specimen con- 

 tained two parts of copper and one of nickel, while mine, as 

 I have already remaiked, seemed to have an unusual propor- 

 tion of copper, to judge from its colour. 



5th Class. 



Nacre with M 90°, f. firm; I 90°, f ; P. G. 90°, f. easv ; 



PI. 90°, f not very easy ; T 90°, f firm and easy ; L 90°,* f. 



firm ; Z 90°, f most easy ; Cop. 90% f firm ; B 90°, f. firm ; 



Ars. 90°, f. most easy ; Gl, 90°, f most easy. 

 Ivory (old) with M 58°; T 48°; GI. 58°. 

 Ivor'y (new) with M 90° + ; T 90° + ; B 90°, f. firm. 

 Enamel (human tooth) with T 90°. 

 Bone (mackerel's) with M 90° ; Cad. 90°. 

 Whalebone with M 90° ; I 90° ; Cad. 90° + . 

 Horn (buffalo's) with M 90°; I 90°; P. G. 90° -f ; Cad. 



90° + ; B 90°, f. very strong. 

 , Horn (cow's) with M 85°; I 90°; P. G. 90° +; Cad. 90° +; 



B 90°, f. not very firm. 

 Horn (chamois') with M 90° ; B 90°, f. not very firm. 

 Albumen with Gl. 90° f , strong. 

 Indian ink with M 70° ; Cad. 90°; L 90° +. 

 Amber with M 75°; Cad. 90°; T 90°. 

 Gas coal with M 15°; Gl. 0. 

 Glue with M 29° ; I 90° + ; P. G. 90°, difficult ; P. 90° + ; 



PI. 90° + ; Cad. 90° + ; T 90^ +j Z 90° +; Gl. 90° -f ? 

 Pig's bristle with T failed. 

 Cat's whisker with M 90° x ; I 90° x ; G 1 8c. 90° X; Cad. 



90° X ; T 90° X ; L 90° X ; Z 90°, difficult ; Cop. 90° x . 

 Human hair (brown, male's) with M 90°; T 90°. 

 Human hair (female's) with M 80°; T 90°+. 

 Human hair (female's, 2nd specimen) with M 76°; T 90° + . 

 Human hair (gray, male's) with M 90° + ; T 50°. 

 Human hair (gray, female's) with M 90° + ; T 90°. 

 Human hair (beard, gray) with M 90° + ; Cad. 90°. 

 Horsehair (gray) with M 90°; T 90°. 

 Horsehair (black) with M 90°; T 90°. 



In this class of animal products the magnetism of the needle 

 is tolerably strong, while that of the other bodies is still more 

 remarkable. The specimen ol ivory (a paper-cutter), which 

 could not be less than thirty old years since the time of its im- 

 portation, only exhibited 58 , but was raised to 74° by contact 



Phil. Mag. S. fj. No. 201.. Suppl. Vol. .'30. 2 M 



