334 Scientific Intellagence. 
necessary at the end of the experiment to count the bulbs contain- 
ing sulphide and the quantity of sulphur in the gas passed 
through the apparatus is at once known. Obviously the limit of 
accuracy in the method may be varied at will by varying the 
strength of the solution and the number of bulbs. If the test is 
to determine only whether the amount of sulphur is inferior to a 
certain maximum limit or not, two bulbs suftice. In the first the 
quantity of the reagent corresponding to this maximum is placed, 
it any blackening appears in the second, then there is an excess of 
sulphur over the permissible amount.—Bull. Soc. Chim., Ul, 
xliii, 70, Jan., 1885. G. F. B 
5. On the Atomic weight of Titanium.—Tuorpe has made & 
. : 
weight of titanium, using several methods. The product em- 
loyed was, in the former set of experiments, titanium tetrachlo- 
e, In the first method 
a known quantity of the tetrachloride was placed in water, a 
quantity of silver slightly less than was required to completely 
precipitate it was dissolved in nitric acid and added to it, and 
av 
48°04, 48°04, 48-06, 47°94, 47°93. In the second method the pre- 
cipitated silver was collected and weighed, and gave 47°99, 47°97, 
48°00, 48°05, 48°05. The third method consisted in decomposing 
a known quantity of the tetrachloride with water, evaporating 
the product to dryness in a platinum dish and weighing the 
resulting titanic oxide. Six experiments gave 47°93, 48°00, 47°99 
47°96, 47°98, 47°94. In the second set of experiments, tetra 
bromide was used. When decomposed with water and titered 
bie dene’ the numbers obtained were 48°04, 48°06, 48°02, 48°08; 
8°0 
- a9 ~ 11 +(H 3, . 
amined in the polariscope, it gave a specific rotation (@)p 
of Loiseau and the melitose of Berthelot.—Ber. Berl. Ch 
xviii, 26, Jan., 1885 
