EXPERIMENT STATION. 



63 



Scotia. But carbonate of lime is much commoner and ought to 

 be much cheaper than sulphate ; so that there is entire propriety 

 in insisting on the superiority of a pure over an impure article 

 in any general statement or comparison. If a farmer ordering 

 ground plaster should have ground limestone supplied him at $8 

 to llO per ton he would feel abused even though the result on his 

 crops were as good as it would have been had he got what he or- 

 dered. Carbonate may help the crops and at the same time out- 

 rage the moral sense. 



Limestone Rock. 



Four samples of this material have been analyzed at the request 

 of Professor B. F. Koons of the Storrs Agricultural School. 



Professor Koons has kindly communicated the following partic- 

 ulai's with regard to them, as well as the analysis of a fifth sam- 

 ple made by Professor J. H. Washburn of the Storrs School. 



Analyses of Limestones. 



JJ. W. of No. Stoning- 

 Near Bolton Notch. Lebanon. Norwich. ton. 



Analysis by 

 944 945 946 947 p-^^h. 



Insoluble in acids, 1.73 80.26 46.51 32.24 4.39 



Oxide of iron and alumina, 1.50 5.'71 4.78 7.56 2.57 



Lime, 53.51 6.67 26.65 22.82 31.17 



Magnesia,... 54 .98 .92 .60 17.80 



Phosphoric acid,. 1 .07 .09 .09 .15 



Carbonic acid and undeter- 

 mined matter, 42.65 6.29 21.05 16.63 44.07 



100.00 100.00 100.00 100.00 100.00 



Carbonate of lime. 95.56 11.91 47.59 40.75 55.66 



Carbonate of magnesia, .. . 1.13 2.06 1.93 1.26 37.38 



"Nos. 944 and 945 are fi'oni a large layer occurring on the east 

 side of the rido;e throuoh which the N. Y. and N. E. railroad cuts 

 at Bolton Notch, about twelve miles east of Hai'tford. 



" No. 945 was taken from the walls of the cut where the layer 

 is about fifty feet thick and resembles the adjoining massive and 

 schistose rocks so much that it was only by the aid of acid that 

 the presence of lime was detected. At the center of this layer the 

 effervescence was very decided with dilute hydrochloric acid, but 

 this character was less marked as the top or bottom of the layer 



