PHILOSOPHICAL TRANSACTIONS. 



Contents op Part III, 1880. 



XXI. A Memoir on the Single and Double Theta-Functions. By A. Cayley, 

 F.E.S., Sadlerian Professor of Pure Mathematics in the University of 

 Cambridge. 



XXII. Eevision of the Atomic Weig ht of Aluminium. By J. W. Mallet, F.R.S., 

 Professor of Chemistry in the University of Virginia. 



XXIII. Description of some Remains of the Gigantic Land-Lizard (Megalania 



prwea, Owen), from Australia. — Part II. By Professor Owen, C.B., 

 F.R.S., &c. 



XXIV. On' the Ova of the Echidna Hystrix. By Professor Owen, C.B., F.E.S., 



&c. 



XXV. On the Determination of the Constants of the Cup Anemometer by Experi- 

 ments with a Whirling Machine. — Part II. By T. E. Eobinson, D.D., 

 F.E.S., &c. 



XXVI. On the Dyn amo-electric Current, and on Certain Means to Improve its 

 Steadiness. By C. William Siemens, D.C.L., F.E.S. 



Index to Part III. 



PHILOSOPHICAL TEANSACTIONS. 

 Part III, 1880, price £ . 



Extra volume (vol. 168) containing the Eeports of the Naturalists attached to the 

 Transit of Venus Expeditions. Price £3. 



Sold by Harrison and Sons. 



Separate copies of Papers in the Philosophical Transactions, commencing -with 1875, 

 may be had of Trubner and Co., 57, Ludgate Hill. 



