Grammes. Grains.
Calcium chloride¹ 299.70 925.8
Magnesium " 56.93 175.7
Strontium " 1.47 4.5
Sodium " 20.16 62.2
Potassium " 5.13 15.8
------ ------
383.39 1184.0
¹Trace of bromide.


There is of course some variation in the bittern obtained from
different brines, but it appears of interest to call attention to this
correspondence in composition, as indicating that the liquid for
filling such grenades is obtained by adding two volumes of water to
one of the "bittern." The latter statement is fairly proved by the
presence of the bromine, and certainly from an economical standpoint
such should be its method of manufacture.--_Amer. Chem. Jour._

* * * * *




MOLECULAR WEIGHTS.


A new and most valuable method of determining the molecular weights of
non-volatile as well as volatile substances has just been brought into
prominence by Prof. Victor Meyer (_Berichte_, 1888, No. 3). The method