Magnetism, ^Cohesion, Adhesion and Viscosity. 511 



L 90=, f. ; Z 90°, f.; Cop. 90= f.; B 90°, f. ; Germ. S. 90% f. ; 



GI. 90°, very easy. 

 Red glass with P. G. 90", f.; P. 90°, f.; PI. 90°, f.; Cad. 90°, f. 



very strong ; T 90°, f. very strong ; L 90°, f. ; Z 90°, f. ; 



Germ. S. 90°, f. 

 Green bottle glass with M 70" ; P 90°, f.; PI. 90°, f.; Cad. 90°, 



f.; T 90°, f. ; L 90% f. ; Z 90°, f. ; Cop. 90°, f. ; B 90°, f. ; 



Gl. 90°, f. 



Porcelain (French) with M 90° ; P. G. 90°, f. ; PI. 90° ; 



B 90°, f. ; Gl. 90°, f. 

 Porcelain (dentist's) with M 74° ; PI. 90°, f. ; L 90°, f. ; 



Z 90°, f. 

 Blue enamel with M 36° ; T 90° x . 



Gypsum stone with M 26° ; Gl. failed. 



Alabaster with M 25° ; Gl. 90° x . 



Marble (gray) with M 55°; Gl8c. 90°, difficult; T. 90°. 



Marble (yellow) with M 10°; P.G. 90° + ; G 18c. 56"; P 80°; 



PI. 90°; Cad. 90° + ; T 90° + ; Z 47°; Gl. 73°. 

 Gas coal with M 15; Gl. 0°. 



Iceland spar with M 90° ; I 90°+ ; P. G. 90°, f. ; G 18 c. 



90°; S 90°, f. easy; P 90°, f. ; PI. 90°, f . ; Cad. 90°, f. ; 



T90°, f.; L 90° + ; Z 90°, f. easy; Cop. 90°, f. firm; 



B 90°, r. strong ; Gl. 90°, f. 

 Felspar with M 10°; Cad. 30°; T 45°; Gl. 90°, f. very firm. 

 Selenite with M 15°; P. G. 86°; T 85°; Gl. 90° + . 

 Talc with M. 60°; I 90° + ; G 18c. 90°; Z 40°. 

 Protosulphate of iron with M 90°, f. very easy; P. G. 90°, 



f. very easy : Gl. 90°, f. very easy and strong. 

 Carbonate of iron with M 16°; 1 20° ; P. G. 90°, f rather 



difficult ; S 90°, f. firm ; P failed ; PI. failed ; Cad. 90°, 



f. firm ; T 90°, f. firm ; L failed ; Z 90°, f most firm ; 



Cop. 14°; 6 14°; Germ. S. 9°; Gl. 90" + . 

 Sulphate of copper with Gl. 90°, f. easy and strong. 

 Crystallized tin with M failed ; I 90°, f. ; P 90°, not difficult; 



PI. 90°, difficult; L 90°, f; Z 90, 1". contact instantaneous; 



Cop. 90°, f ; B 90°, f. strong ; Germ. S. 90° ; Gl. 90°, 



f. contact instantaneous. 



Alum with M 15°; Gl. 90°, f. 



Rock salt with Gl. 90°, f. very strong. 



Sugar candy (white) with P. G. 90° + ; T 90°-+ ; Gl. 90° f. 



Sugar candy (brown) with Gl. 90° f. 



In this class it will be seen that iron in many cases main- 

 tains a great superiority over the n)iignet. The gUisses seemed 



