On the Multisection of an Angle, &;c. 217 



of Science (about twelve or fourteen years ago) Anil show the 

 numerous additional fossils whicli he got, all Avith the same 

 geological significance, as I stated, though said to be simply 

 an impossibility by ^Nfr. Clai'kc. 



8th. The matter of the Lepidodendron from the Manilla 

 river (l)ut not, as it should be for the argument, from the 

 Glossopteris beds) will be well understood from my former 

 '' Comiuentary." On communicating, two days ago, with 

 j\Ir, Sclwyn, he reiterates his possitive assertion that he told 

 Mr. Clarke of the Gipps Land Lepidodendron in our ^Museum, 

 and brought him to the case, and pointed it out to him; the 

 insinuation of ]Slr. Clarke was that he discovered an impor- 

 tant fossil in our national collection, of the nature of which 

 we were ignorant. !Mr. Sclwyn is aware that I determined 

 its true nature at the first glance, some years before, and that 

 he expressly pointed it out and explained it to ]\Ir. Clarke. 

 Further, ]\Ir. SchvTu (who was present) again authorises me 

 to say that the account I have given in the " Commentary" 

 exactly coincides with the distinct impression he received 

 from ^Iy. Clarke's account of the coalpits at Stoney Creek ; 

 he remembers perfectly, as I do, the sections drawn with a 

 pencil, by j\Ir. Clarke, illustrating his statement — that the pit 

 was sunk thrpugh the plant beds near the surface into the 

 marine beds, and that he had not been there, and had no 

 evidence that the plant specimen had actually been in situ 

 below the marine beds. 



Art. XV. — On the Multisection of an Angle by means of the 

 Cycloid. By the Hon. David Elliot Wilkie, M.D., M.L.C. 



[With a Plate.] 



[Read before the Royal Society of Victoria, 25th June, 18C0.] 



The writer of this paper feels that he owes some apology for 

 venturing to offer a new illustration of the trisection or mul- 

 tisection of an angle. He has devoted very little time to 

 mathematical studies, and his attention was directed, quite 

 accidentally, to the subject of this paper. 



It is well known that there is no mode by wliicli this pro- 



