CONTENTS. 
VOLUME LII. 
Art, I.—PRESIDENTIAL ADDRESS. By J. Burton CLELAND, 
M.D., Ch.M. Issued September 5th, 1918. 500 : roe 
Art. II.—The Spine Mode of Centropyzxis aculeata, Stein. By 
C.D. Giuuies, use. [With Eight Text Figures.] Issued 
September 12th, 1918. sic ee a 
Art. III.—A new species of Leptospermum si its Recontial oil. 
By R. W. CHALLINOR, F.c.S., E. Coren and A. R. PENFOLD. 
Issued September 18th, 1918. iat a vas 
Art. [V.—Notes on some Permo-Carboniferous eneetaltide: (with 
descriptions of new species). By C. F. Laszron. [With 
Plates I-XVI.] Issued October 17th, 1918. ba 
Arr. V.—A Simple Progressive Tax, and its benrine on fe 
Federal Income Tax and other Acts. By Professor H. S. 
CARSLAW, M.A., Sc.D. Issued October 17th, 1918. ‘ 
Art. VI.—A contribution to a History of the Royal Society of Nod 
South Wales (with information in regard to other New South 
Wales Societies). By J. H. MaIpgEn, I.s.0., F.R.S., F.L.S. 
Issued December 30th, 1918. dee 
Art. VII.—On the Technology and Anatomy of some Silky Oak 
Timbers. By R. T. Baxsr, F.u.s. [With Plates XVII - ae 
Issued March 24th, 1919.. 
Art. VUII.—TheVertical Growth of Trees. By R. H. Cems F.L.S. 
Issued January 16th, 1919. BAe sis 
ArT. 1X.—The Darling Peneplain of Western matte By Prof. 
W. G. WooLnouaH, D.sec., F.a.s. [With Plate XXX.| Issued 
January 16th, 1919. ai Ae i aise 
ArT. X.—Experiments on the behaviour of eee in contact with 
Sulphuric Acid. By Prof. C. E. Fawsirt, D.sc., Ph. D., and 
A. A. PAIN, B.Sc. Issued January 24th, 1919 . 
Art. XI.—Note on the Resinous earth occurring at fe head of fe 
Nambucca River, N.S.W. By H.G. Smiru, F.c.s. Issued 
January 24th, 1919. 
Art. XII.—Acacia Seedlings, Part Iv. By R. H. Gitar F.L.S. 
[With Plates XXXI-—XXXV.] Issued March 7th, 1919. 
AgtT. XIII.—Preliminary Investigations on a Bacterial Disease 
of Tobacco. By G. P. Darnexu-SmITH, B.se., F.1.c. [With 
Plate XXXVI.| Issued March 24th, 1919. 
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