1921.] 



Notes on Mantres for Apiul 



85 



muriate of soda (common salt) . The lower grade contains 

 approximately 19 to 25 per cent, of muriate of potash, 00 la 

 66 per cent, of muriate of soda, 2 to 5 per cent, of sulphate of 

 lime, and 10 to 12 per cent, of insoluble matter; the higher 

 grade contains approximately 32 to 85 per cent, of muriate 

 of potash, 50 to 55 per cent, of muriate of soda, 2 to 5 per cent, 

 of sulphate of lime, and 9 to 10 per cent, of insoluble matter. 

 Either 'grade would be worth trying on mangolds or grassland. 

 The effect on potatoes is being carefully tested this year at 

 Kothamsted. 



Confusion between Chalk, Lime and Limestone. — Instances 

 have been brought to the writer's notice of a confusion between 

 lime and limestone or chalk, which is adversely affecting some 

 of the farmers in whose minds it exists. It is unfortunate that 

 these words are all used in rather a loose way, as if they meant 

 the same thing. They do not, and there is really a consider- 

 able difference between them. In buying lime the farmer 

 should be perfectly certain as to what the analysis means, and 

 if he is in any doubt should communicate with the County 

 Organiser. If one invoice guarantees 90 per cent, of pure chalk 

 or pure limestone or pure calcium carbonate, and another 

 guarantees 50.4 per cent, of pure lime or pure oxide of lime, 

 these two quantities are not different but the same. There 

 being no legal form of guarantee a dealer is fully justified in 

 describing the material in whatever way he thinks most attrac- 

 tive, but the farmer who is buying should be perfectly clear in 

 his mind what it is he is getting. 



