SOLUBILITIES UNITS. 



387 



Calcium sulphate,- CaS0 4 .2H 2 

 Copper sulphate, CuSO 4 .5H 2 ... 

 Ferrous sulphate, FeS0 4 .7H 2 ... 

 Magnesium sulphate, MgSO 4 .7H 2 

 Potassium carbonate, K 2 CO ;S 



chloride, KC1 

 ,, nitrate, KNO H 

 ,, sulphate, K 2 S0 4 

 ,, chloroplatinate, KjPtCl 6 

 Sodium bicarbonate, NaHC0 3 ... 

 ,, carbonate, Na 2 C0 3 i 



Na. 2 CO 8 .10H 2 

 ,, chloride, NaCl 

 ,, nitrate, NaNO 



phosphate, Na 2 HP0 4 .12H 2 O 



sulphate, Na. 2 S0 4 .10H 2 OJ: 

 ,, sulphate, Na 2 S0 4 . 



8-15 decomposes 

 12-06 45-4 



538-0 

 39-8 

 180-0 

 f melts be- 

 \low 100 

 ...about 23 241-0 

 9-0 42-5 



... 40-9 

 ... 35-8 

 ... 80-1 



.. about 9 



THE BRITISH AND METRIC SYSTEMS OF UNITS OF LENGTH, 

 AREA, VOLUME, AND WEIGHT. 



The inconvenience and cumbrousness of our Bribish system 

 of weights and measures have too often been pointed out 

 to need further reference here; but in agricultural matters, 

 perhaps, more than in other commercial branches, the incon- 

 sistencies of the current systems of units are strikingly evident. 

 In addition to the disadvantages common to all our measures 

 and weights, there are such anomalies as selling grain nomi- 

 nally by volume (bushels and quarters) and then fixing definite 

 weights for these volumes, necessarily different for different 

 kinds of grain, and what is even worse, different in different 

 districts. However, custom in these matters is so powerful 

 that it will probably be long before such anomalies are 

 abolished. 



* Most soluble in water at 35 ; 0'279 parts then dissolve. 



t Is most soluble about 38, when 100 parts of water dissolve 51 '67 parts of the 

 anhydrous salt or 1142 parts of the soda crystals. 



t Is most soluble about 33, when about 412 parts of the decahydrated or 50 '6 of the 

 anhydrous salt dissolve. 



cc 2 



