SOIL FERTILITY. 



On the Status of Chelonia depressa, Garman. Rec. 



Austr. Mus., X., 7, 1913, pp. 159-185, pis. xix-xxii. 

 A Re-Examination of Macleay's New Guinea and 



Queensland Frog Types. Memoirs Qld. Mus., ii, 



1913, pp. 46-50. 



On a Collection of Reptiles and Batrachians from 

 Western Australia. Records W. Austr. Mus., 1., 



1914, pp. 174-210, pis. xxvii-xxviii. 

 Herpetological Notes. Proc. Roy. Soc. Qld., xxvii (1), 



1915, pp. 60-95, pis. i-iv. 



Description of Aphantophnjne, a new Batrachian 

 Genus from New Guinea, with Comparative Notes 

 on the Pectoral Musculature. Proc. Linn. Soc. N.S. 

 Wales, xli., 1916, pp. 770-785, pis. liv-lv. 



SOIL FERTILITY. 



The greatest problem confronting any nation is that of 

 food supply, and particular attention has been directed to 

 this matter during the period of the present war. The 

 cultivation of the soil for food is therefore the most import- 

 ant occupation of man, and for this reason there has been 

 soil investigation from the earliest times. And the country 

 with the most knowledge concerning the best methods of 

 soil management, in connection with the various tyj)es of 

 sofl existing within its area, has the greatest power for 

 the economical jiroduction of food. 



The object of soil study is to gain knowledge in respect 

 to the factors which are favourable or unfavourable to 

 soil fertility. 



That soil fertility depends upon a number of factors 

 is now an accepted fact, and these factors are grouped under 

 the headings — Chemical, Physical, and Biological. It is 

 recognised that deficiency in any condition included under 

 the above headings may have considerable influence upon 

 soil fertility, also that climate, distribution of the annual 

 rainfall, etc., have very marked influence uj)on crop pro- 

 duction. 



