ON KAOLINITE FROM THE HAWKESBURY SANDSTONE. 171 



then eight years as their probable age in February 1885, they 

 would now be almost fifteen years old, and the tree measured is 

 now 4 feet 4J inches round, three feet above the ground. 



The Eucalyptus globulus on Observatory Park is now sixteen 

 years old and is three feet ten inches round, three feet above the 

 ground, or six and a half inches less than the tree at Lake George 

 which is a year younger. The trees on Mount Victoria measured 

 about sixty-three inches round after fifty years growth, and the 

 measures on the Lake George tree seem to justify us in assuming 

 that it enlarged uniformly year after year. 



Therefore at 15 years old the Mount Victoria tree measured 19 in. 

 15 „ the Lake George tree measured *52£ in. 

 15 „ the Observatory Park tree measured 43 in; 



The trees are all Eucalypts. 



On KAOLINITE from the HAWKESBURY SANDSTONE. 



By Henry G. Smith. Laboratory Assistant, 

 Technological Museum, Sydney. 



Communicated by J. H. Maiden, f.l.s., f.c.s. 

 [With Plate XXIII.] 



[Bead before the Royal Society of N.8. Wales, December 2, 1891. .] 





Messrs. Johnson and Blake conclude their paperf in which they 

 found the mineral Kaolinite, by suggesting the advisability of 

 further investigations, by a study of the physical properties, and 



* The probable age at this measure was 14 years 8£ months if allowance 

 for 3^ months is made to bring the age up to 15 full years, it would 

 measure 53f inches round. 



f American Journ. Sci., 2nd Series, Vol. xliii., p. 351. 



