78 



Intelligence and Miscellaneous Articles. 



already made its mark. The editor, besides having carefully revised 

 the text, has added a few brief notes and some dozen problems ex- 

 tracted from recent Tripos and Smith's Prize papers. We should 

 prefer a treatise of this kind in a somewhat larger size, as the 

 formulae are long and make the pages look crowded : on the other 

 hand, the present form is handier for use. 



VIII. Intelligence and Miscellaneous Articles. 



ON THE MAGNETISM OF ORGANIC BODIES. 

 BY S. WLEUGEL AND S. HENRICHSEN. 



HPHE authors have examined the magnetism of some compounds 

 -*- of the alcohol radicals C w H 2 n+i. The bodies in question, which 

 were partly prepared by the authors themselves and partly obtained 

 from M. Kahlbaum, were all carefully purified before being used. 

 For the measurements, they were placed in a small glass vessel. 

 This was of a somewhat long horizontal shape, and had a bifilar 

 suspension, so that it oscillated between the pointed half -armatures 

 of a large horseshoe electromagnet. The current was that of 16-18 

 Bunsen's elements. The magnetism excited in the bodies was 

 measured by a torsion method with a mirror reading like that pre- 

 viously used by Gr. Wiedemann. The results are collated in the 

 following table ; m is here the specific magnetism, that of water 

 being —100, fx is the molecular magnetism, and q the molecular 

 weight. The negative prefix indicates diamagnetism. The mag- 

 netism of the displaced air was taken into account. 



The numbers here given are only provisionally to be considered 

 as correct, as the authors wish once more to test the purity of the 

 substances used. They are, however, sufficiently trustworthy to 

 justify several interesting conclusions. 





m. 



fi. 



i , 





-94-40 



58-01 



102-34 



80-90 



101-09 



61-96 



68-90 



105-48 



10751 



107-51 



6665 



74-48 



100-08 



107-84 



109-80 



96-07 



100 



-3021 

 8238 

 6345 

 5987 

 4759 

 9665 

 7511 

 9493 

 6451 

 6451 



11331 

 9161 

 7857 



12729 

 8125 



11167 

 1800 



32 



142 



62 



74 



46 

 156 

 109 



90 



60 



60 

 170 

 123 



78-5 

 118 



74 

 116 



18 



,, iodide 



„ sulphate 



Ethylic alcohol 



, , iodide 



,, bromide 





Propylic alcohol 



Isopropylic alcohol 





„ chloride 



,, sulphide 



Isobutyric alcohol 





Water 





