372 Hilda Kincaid : 



stand 15 minutes, when it was then quickly filtered through a 

 Gooch filter, the collected precipitate washed thoroughly with 

 cold water (about six washings), and then dissolved in a known 

 volume of standard sodium hydrate, boiled to expel all the 

 ammonia thus liberated, and when cool the excess of NaOH 

 back titrated with standard acid. The amount of P.jO,-, cal. 

 culated from the number of c.c. of the standard alkali used. 



Experimental. 



A (1). — Experiments wrrn Fodder Grasses. 



To Professor Ewart I am indebted for his kindness in supply- 

 ing me with samples of 20 fodder grasses ; some of them native 

 to Australia, and some of them introduced, but all acclimatised 

 and growing in a wild state free from any artificial manuring. 



It was expected that the native grasses accustomed for a long 

 epoch of time to a low supply of phosphorus in the soil would 

 manage with very little of this element, and therefore an 

 analysis would show a low percentage of P2O5. On the other 

 hand it was expected that the introduced grasses, accustomed 

 to a fairly high supply of phosphorus, would not show the 

 economy practised by the native grasses with regard to this 

 element, but would show on analysis a higher percentage of 

 PoO.^. which, however, might be lower than that obtained for 

 the same grasses growing in countries whose soil is not so low 

 in this element. The following table shows the results ob- 

 tained : — 



Percentagk of P.2O3 i\ Fodders (Dima) at lOU' C). 

 Native and Introduced Grass. 



Native. 



.. . ^ % Mean % 



iSame or (jrrass P O F O 



Imperata arundinacea — Lang Lang Grass (1) 0.1659 0.1680 



(2) 0.1701 



Stipa scabra— Rough Spear Grass - - (1) 0.1600 0.1543 



(2) 0.1487 



Chloris truncata— Windmill Grass - - (1) 0.1977 0.2023 



(2) 0.2069 



