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ACTION OF HEAT ON COMPOUNDS OF DIMETHYL-THETINE. . 995 
which had a pungent and disagreeable smell. The first and second crops 
of crystals, and the crystalline crust, I shall call for convenience B1, B2, 
and B3 respectively. 
B3 could not be readily crystallised from alcohol or water, as it was ex- 
ceedingly soluble in these. 
Its aqueous solution yielded with—— 
(1.) Nitrate of silver solution, a yellowish precipitate which dissolved on 
stirring. The silver salt added in excess caused a permanent yellow precipitate 
which was not crystalline. 
(2.) Solution of acetate of lead, a white, curdy, precipitate, which rapidly 
became crystalline. 
(3.) Chloride of zinc solution (after neutralisation with ammonia), a crystal- 
line precipitate. 
B2 dissolved in water yielded with—— 
(1.) Nitrate of silver solution, a white, curdy, precipitate, which rapidly 
became crystalline. 
(2.) With acetate of lead, a precipitate behaving in a similar manner.* 
B1 behaved as B2. 
A quantity of the lead and silver salts of B2 were prepared and analysed. 
A combustion of B2 was also made. 
From the results of these analyses there can be little doubt that B2 con- 
sists of thiodiglycollic acid 8(CH,COOH),, first prepared by Scuutze,t and 
from subsequent observations B1 and B3 were found to consist of the same 
substance—B1 in a somewhat purer, B3 in a somewhat less pure condition. 
The results of the analyses are as follows :—— 
B2. 
‘3635 erms. gave ‘1478 grms. water ; . = 46 per cent. hydrogen. 
OOO. 5, » 435 » carbonic anhydride = 32°6 . carbon. 
MmeetcCOOH) requires . 9 . =... | Be 2a ee 
32:0 x carbon. 
Lead Salt of B2. 
‘3283 orms. gave ‘2765 sulphate of lead . = 575 per cent. lead. 
ror 4 MOUS iN : hak ile ‘ . 
10208 _,, » 0970 sulphate of barium . . = 84 3 sulphur. 
"9353 »” » 5943 ” 0 . => 80 ” ” 
2245 -,, , 6047 carbonic anhydride . tt Eso o carbon. 
M2245 _,, »  °1398 water ; ; . 5 alee ‘ hydrogen. 
* This change, when observed under the microscope, was very curious. The acetate of lead first 
occasioned the precipitation of warty masses, which dissolved of their own accord, and from the 
solution groups of needles shot out. 
1 Scuuuzs, “ Jenaische Zeitschr.” i. p. 470 (1864); “Bull. Soc. Chim.” v. p. 130 (1866). 
VOL. XXVIII. PART IL. 7p 
