Magnetism, Cohesion, Adhesion and Viscosity. 5\5 



miuni. Three specimens of vegetable ivory were tried on 

 many occasions with great care, and the results they afforded 

 were always uniform, but differed from one another. The 

 first specimen gave 56° with the magnetic needle, but the two 

 others failed altogether. On two or three occasions the mag- 

 netic needle connected itself with one of the specimens that 

 had previously failed, after it had been kept in contact with a 

 magnet ; but 1 cannot positively say that the magnet was the 

 cause, as on repeating the same experiment on other occa- 

 sions, no such result took place; still the needle did not con- 

 nect Itself till after the attempt to raise its magnetisn), though 

 many trials had previously been made. The attraction of 

 iron for all three specimens is deserving of notice. This sin- 

 gular substance exhibited a strong affinity for all the needles 

 with which it was tested. The affinity of lac for various metals 

 and substances, including glass, is worthy of attention. Sealino-. 

 wax and India rubber of the bottle kind exhibit a stroma 

 affinity for many non-ferruginous bodies. "^ 



I have thought that it would be useful to sum up all the 

 preceding results, in such a way as to exhibit their relative 

 affinities; and with this view they have been thrown into the 

 following tabular fbrni, which though it does not contrast 

 cases altogether analogous, because the substances the needles 

 were tried with were not always the same, still some general 

 inferences may be drawn from them, not devoid of interest. 



Results of the Measurements. 



If the relative affinities thus elicited could l)e depended 

 upon, the substances would be arranged as follows, and their 

 2 M 2 



