The following table, prepared by E. Finot and Arm. Bertrand for the Jour. de Ph. et de Chim., shows the point at which the evaporation of certain solutions is to be interrupted in order to procure a good crop of crystals on cooling. The density is according to Baumé's scale, the solution warm:

 Aluminum sulphate 25 | Nickel acetate 30

Alum (amm. or pot.) 20 | " ammon. sulphate 18

Ammonium acetate 14 | " chloride 50

" arsenate 5 | " sulphate 40

" benzoate 5 | Oxalic acid 12

" bichromate 28 | Potass. and sod. tartrate 36

" bromide 30 | Potassium arsenate 36

" chloride 12 | " benzoate 2

" nitrate 29 | " bisulphate 35

" oxalate 5 | " bromide 40

" phosphate 35 | " chlorate 22

" sulphate 28 | " chloride 25

" sulphocyanide 18 | " chromate 38

" tartrate 25 | " citrate 36

Barium ethylsulphate 43 | " ferrocyanide 38

" formate 32 | " iodide 17

" hyposulphite 24 | " nitrate 28

" nitrate 18 | " oxalate 30

" oxide 12 | " permanganate 25

Bismuth nitrate 70 | " sulphate 15

Boric acid 6 | " sulphite 25

Cadmium bromide 65 | " sulphocyanide 35

Calcium chloride 40 | " tartrate 48

" ethylsulphate 36 | Soda 28

" lactate 8 | Sodium acetate 22

" nitrate 55 | " ammon. phosp. 17

Cobalt chloride 41 | " arsenate 36

" nitrate 50 | " borate 24

" sulphate 40 | " bromide 55

Copper acetate 5 | " chlorate 43

" ammon. sulph. 35 | " chromate 45

" chloride 45 | " citrate 36

" nitrate 55 | " ethylsulphate 37

" sulphate 30 | " hyposulphite 24

Iron-ammon. oxalate 30 | " nitrate 40

" ammon. sulphate 31 | " phosphate 20

" sulphate 31 | " pyrophosphate 18

" tartrate 40 | " sulphate 30

Lead acetate 42 | " tungstate 45

" nitrate 50 | Stroutium bromide 50

Magnesium chloride 35 | " chlorate 65

" lactate 6 | " chloride 34

" nitrate 45 | Tin choride (stannous) 75

" sulphate 40 |

Manganese chloride 47 | Zinc acetate 20

" lactate 8 | " ammon. chloride 43

" sulphate 44 | " nitrate 55

Mercury cyanide 20 | " sulphate 45