348 PROCEEDINGS OF SECTION H. 
They were kept in lead trays, through which water (Yan 
Yean) was allowed to slowly trickle. | 
The tests at seven days and twenty-eight days are not plot- 
ted, as they were used merely to serve as control over cement, 
and to show that an increase did take place. 
The results are an average of the number of briquettes 
shown in column; in all they total 4592. 
The long-date tests were made from three briquettes, and 
the average is put down at each of the following dates, viz., 
3, 6, 9, 12, 18, 24, 30, 36, 42, 48, 54, 60, and 66 months, 
making in all over 5000 briquettes broken for the results on 
table. 
In looking at the appended diagrams it will be noticed that 
in the chemical analyses only the lime, silica, insoluble silica, 
and oxide of iron and alumina are given, the amount of 
magnesia being small and always under 2 per cent.; in a 
few cases small quantities of sulphuric acid were determined. 
The results of fineness were only taken on a 2500 mesh stan- 
dard sieve, as that is what was specified; now we get a very 
much greater degree of fineness, only some 5 or 6 per cent. on 
a 32,000-mesh sieve. The specific gravity, it will be noticed, 
varies from 2.96 to 3.15. 
It is noticeable in the appended graphic curves that in three 
cases, viz., Alsen, Gillingham, and Formby, a drop takes place 
at six months, which in the case of Formby continues for the 
nine and twelve months, and that they then rise. 
In another case, viz., Wouldham, the fall takes place at nine 
months, continuing to twelve months before rising. 
Two cases, viz., Alsen and Gresham, apparently .reach their 
maximum strength at twelve months, thereafter continuing at 
the same strength, the variations being within the limits of 
error. 
In one case, viz., Anchor, there is a heavy rise to nine 
months, followed by a gradually decreasing rate of rise. 
In one case there is a heavy rise to eighteen months, and 
then a fluctuating movement, viz., in White Bros. 
In the case of Invicta brand, after a sharp rise to six months, 
followed by a fall at nine and twelve months, a fairly steady 
rise takes place. 
In two cases, viz., Wouldham and Formby, after the fall 
up to twelve months, a comparatively uniform increase takes 
place. 
There are three brands which run almost identically, viz., the 
well-known Knight, Bevan and Sturge brand, and the two Vic- 
torian cements, viz., Australian Portland and the Emu brand ; 
