396 F. B. GUTHRIE AND R. HELMS. 



The results with barley are tabulated below : — 

 Effect upon germination and subsequent growth of Barley oj 

 different percentages of injurious substances in the soil. 



NaCl 



Germination Germination 

 affected prevented 



•1 '25 



Growth 

 affected 



•10 



Growth 

 prevented 



•20 



Na 2 C0 3 



•25 *60 



•15 



•40 



NH 4 CNS 



inconclusive 







NaClOa 



•005 -007 



•003 



•006 



As 2 3 ger 



initiation unaffected by '6 



•05 



•10 



IV. Rye — Experiments with NaCl. 

 Five pots were filled with soil, to which was added 10 

 grms superphosphate per pot, and the following quantities 

 of sodium chloride : — ■ 



No. 136, *05 per cent. 

 „ 137, -10 

 „ 138, *-15 

 „ 139, -20 

 „ 140, '25 



These pots were sown on August 6th, 1903, in the usual 

 manner, the surface being covered with a mulch of shredded 

 coco-nut fibre and the soil kept moist throughout the 

 experiment. A check pot was sown at the same time. 



The pots were examined in August 21st, when the 

 following observations were made : — 



In No. 136 the plants had germinated well but the growth 

 was rather backward compared with that in the 

 check-pot. 



In No. 137, the germination was already affected and the 

 growth considerably retarded. 



In the remaining three pots both germination and sub- 

 sequent growth were very markedly affected. 



The pots were again examined on September 29th, 1903, 

 when it was found that the plant in pots 136 and 137 had 

 recovered and were apparently making as vigorous growth 



