390 F. B. GUTHRIE AND R. HELMS. 



POT EXPERIMENTS to DETERMINE the LIMITS OF 



ENDURANCE of DIFFERENT PARM-OROPS for 



CERTAIN INJURIOUS SUBSTANCES. 



By F. B. Guthrie, f.i.c, f.c.s., and R. Helms. 



[Read before the Royal Society of N. S. Wales, November 2, 1904.'] 



Part III. — Barley and Rye. 

 The experiments which form the subject of the present 

 communication were carried out last year and are in con- 

 tinuation of those already communicated to you with 

 regard to wheat and maize. 1 They were conducted in pre- 

 cisely the same manner, and it will be unnecessary to go 

 into the detail of the methods adopted which will be found 

 in full in this Journal, XXXVI., p. 191. 



The soil with which the pots were filled was a rich garden 

 loam mixed with a nearly equal quantity of light sand. 

 Bach pot received a manuring of 10 grms superphosphate, 

 and all were exposed to precisely the same conditions as to 

 light, warmth, water, etc., throughout the course of the 

 experiment. Check pots were filled and sown in exactly 

 the same way, except that the deleterious substances were 

 omitted. 



III. Barley — Experiments with Common Salt. 

 Eight pots were filled with the soil together with a light 

 manuring with superphosphate and the following quantities 

 of common salt per 100 lbs. of soil : — 



No. 84, '10 per cent. NaCl. 



86, *20 





87, *25 



»» »? 



88, -30 



n »i 



89, *35 



n n 



90, '40 



n ii 



91, *50 



ii ii 



This Journal, xxxvi., p. 191, and xxxvn., p. 165. 



