NOTICE. 



The Royal Society of New South Wales originated in 1821 as- 

 the "Philosophical Society of Australasia"; after an internal of 

 inactivity, it was resuscitated in 1850, under the name of the 

 " Australian Philosophical Society," by which title it was known 

 until 1856, when the name was changed to the "Philosophical 

 Society of New South Wales"; in 1866, by the sanction of Her 

 Most Gracious Majesty Queen Victoria, it assumed its present 

 title, and was incorporated by Act of the Parliament of New 

 South Wales in 1881. 



TO AUTHORS. 



Authors of papers desiring illustrations, are advised to consult 

 the editors (Honorary Secretaries) before preparing their drawings. 

 Unless otherwise specially permitted, such drawings should be 

 carefully executed to a large scale on smooth white Bristol board 

 in intensely black Indian ink, so as to admit of the blocks being 

 prepared directly therefrom, in a form suitable for photographic 

 "process." The size of a full page plate in the Journal is 4 J in. 

 x 6J in. The cost of all original drawings, and of colouring plates- 

 must be borne by Authors. 



ERRATA. 



±fhv' 



Page 208, line 3, after loss of head, read 



Page 208, line 5, after gravitation constant, read h = depth of 

 bore in feet. 



Page 425, lines 4 and 5, for W. 10° N., read W. 10° S. 



Page xviii, line 15, after with, read 'contour planes.' 

 ,, xxvii, line 15, for used, read 'seems.' 

 ,, xxviii, line 9, for in, read 'into.' 

 ,, xxx, line 29, for not, read 'no.' 

 „ xxxi, line 26, after 750, read 'lbs. per square inch.' 

 ,, xxxii, lines 5 and 17, for 1 inch, read 'lineal.' 

 ,, xxxiii, line 15, delete whole line except the word 'the ' 



