1883.] Prof. D. E. Hughes. On a Theory of Magnetism. 19 



II. "On the Affinities of Thylacoleo." By Professor Owex, C.B., 



F.R.S., &c. Received January 25, 1883. 



(Abstract.) 



Since the communication of the paper " On Thylacoleo," in the 

 " Philosophical Transactions" for 1871, farther explorations of the 

 caves and breccia-fissures in Wellington Valley, New South "Wales, 

 have been made, by a grant for that purpose from the Legislature of 

 the Colony, and carried out by E. B. Ramsay, Esq., F.L.S., Curator 

 of the Museum of Natural History, Sydney. The present paper treats 

 of the fossils contributing to the further restoration of the great car- 

 nivorous Marsupial (Thylacoleo carnifex, Ow.). They exemplify the 

 entire dentition in situ of the upper and lower jaws of a mature indi- 

 vidual : the bones of the fore-limb, of which those of the antibrachium 

 and the ungual phalanges are described, are compared with those of 

 other Marsupials, and of placental, especially feline, Carnivora. An 

 entire lower jaw with the articular condyles adds to the grounds for 

 determination of the habits and affinities of the extinct Marsupial. 



Figures of these fossils of the natural size accompany the paper, 



III. " Preliminary Note on a Theory of Magnetism based upon 

 New Experimental Researches." By Professor D. E. 

 Hughes, F.R.S. Received January 27, 1883. 



In the year 1879* I communicated to the Royal Society a paper 

 On an Induction Currents Balance and Experimental Researches 

 made therewith." I continued my researches into the molecular 

 construction of metallic bodies, and communicated the results then 

 obtained in three separate papersf bearing upon molecular mag- 

 netism. 



To investigate the molecular construction of magnets required again 

 special forms of apparatus, and I have since been engaged upon these, 

 and the researches which they have enabled me to follow. 



From numerous researches I have gradually formed a theory of 

 magnetism entirely based upon experimental results, and these have 

 led me to the following conclusions : — 



1. That each molecule of a piece of iron, steel, or other magnetic 

 metal is a separate and independent magnet, having its two poles and 

 distribution of magnetic polarity exactly the same as its total evident 

 magnetism when noticed upon a steel bar-magnet. 



* " Proc. Eoj. Soc," vol. 29, p. 56, 1879. 



f " Proc. Eoj. Soc," vol. 31, p. 525 ; vol. 32, pp. 25, 213, 1881. 



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