574 Notices respecting New Books. 



new Principle of constructing Ships in the Mercantile Navv. By 

 Sir Robert Scppiiigs, F.R.S.— IX. On the Milk Tusks and 

 Organ of hearing of the Dugong. By Sir Everard Home, Bart., 

 V.P.R.S. — X. Upon the different Qualities of the Alburnum 

 of Spring- and Winter-felled Oak Trees. By Thomas Andrew 

 Knight, Esq. F.R.S. — XI. On the Mode of Formation of the 

 Canal for containing the Spinal Marrow, and on the Form of 

 the Fins (if thev deserve that Name) of the Proteosaurus. By 

 Sir Everard Home, Bart. V.P. R.S. — XII. Some Experiments 

 on the Fungi which constitute the colouring Matter of the Red 

 Snow discovered in Baiiin's Bay. By Francis Bauer, Esq. F.L.S. 

 In a Letter addressed to the Right Hon. Sir Joseph Banks, 

 Bart. G.C.B.P.R.S. — XIII. Some Account of the Dugong. 

 Bv Sir Thomas Stamford Raffles, Governor of Sumatra. Com- 

 municated in a Letter to Sir Everard Home, Bart. \.P.R.S. — 

 XIV. Observations on the Human Urethra, showing its internal 

 Structure, as it appeared in the Microscope of F. Bauer, Esq. 

 By Sir Everard Home, Bart. V.P.R.S,— XV. On the Errors iix 

 Longitude as determined by Chronometers at Sea, arising from 

 the Action of the Iron in the Ships upon the Chronometers. By 

 George Fisher, Esq. Communicated by John Barrow, Esq. 

 F.R.S. — XVI. An .Account of a new Mode of performing the 

 High Operation for the Stone. By Sir Everard Home, Bart. 

 V.P.R.S. — XVII. A Sketch of an Analysis and Notation appli- 

 cable to the Estimation of the Value of Life Contingencies. By 

 Benjamin Gonipertz, Esq. F.R.S.— XVIII. On the Measure- 

 ment of Snowdon bv the Thermometrical Barometer. By the 

 Rev. F.J.H. Wollaston, B.D. F.R.S.— XIX. On Sounds in- 

 audible by certain Ears. By William Hyde Wollaston, M.D. 

 P. R.S. — XX. Particulars respecting the Anatomy of the Du- 

 gong, intended as a Supplement to SirT. S. Raffles's Account of 

 that" Animal, By Sir Everard Home, Bart. F.R.S — XXI. On 

 the Compressibility of Water. By Jacob Perkins, Esq. Com- 

 municated by the late Right Hon. Sir Joseph Banks, Bart.G.C.B. 

 p,R.S. — XXII. Astronomical Observations. By Stephen Groom-? 

 bridge, Esq. F.R.S. 



On Mr. Holdrkd's Tract entitled " A new Method of Solving 

 Equations," (^c. and Mr. NICHOLso^'s "Essay on Involu- 

 tion and Evolution." 



To Mr. Tillock. 

 Sir, — If you will insert the inclosed in your Philosophical 

 Btagazine, you will greatly oblige 



Your humble servant, 



Theophilus Holdred. 



Since 



