64 THE ROYAL SOCIETY OF CANADA 



The sodium sulphate in "A" and "B" is approximately 1-0 per 

 cent. This is associated with small percentages of magnesium sul- 

 phate. The crop was apparently struggling with little success, the 

 alkali, evidently, closely approaching the limit of toxicity. 



Group 1691. No growth, soil wet, alkali showing, and entirely 

 destitute of vegetation. Nature of soil: "A," dark brown, sandy 

 loam, wet, with efflorescence, air-dries to small friable lumps almost 

 grey, due to incrustation; "B," dark brown sandy clay, wet, plastic, 

 with marked efflorescence on drying; "C," reddish-brown sandy clay, 

 slightly damp, plastic, slight efflorescence on drying; "D," greenish - 

 grey clay, wet, dries into light yellow, hard lumps which exhibit 

 efflorescence. 



It will be remarked that magnesium salts are practically absent 

 and further that the soil is free from chlorides and carbonates; growth 

 in this instance must be inhibited entirely by sodium sulphate, which 

 in the surface 6 inches reaches a concentration of 2 per cent. 



Timothy 



Series XII. Section 7, Township 22, Range 22, West of the 4th 

 Meridian. 



This group was taken from an irrigated field \}/2 miles east of 

 Gleichen, Alta. The area had been under irrigation for 6 years and 

 had received three waterings in the season of 1919 before the date of 

 inspection, July 24th. The third application of water had been made 

 one week previous to the collection of the samples. The surface soil 

 is a rich, dark loam and the subsoil a mixture of silt and fine sand. 

 In the best parts of the field the crop was good, the timothy being 

 quite thick and of a good length. 



