180 ANNUAL REPORT 
a soft marl from near Peebles, Ohio, and was used in three varieties . 
differing slightly in composition. The composition was quite closely: 
Per Cents. 
Aad b Kets Reman aie OREM uremia Aan etsy! hin Mabe Le hap salAe ra. te 0.42 
PAWGbiadubat: Perra Aateind ube yt hat Ane Ach i Arup bate ane: Curr Aah GIN 0.54 
Cal ciummycarbonace maven renee tien terrae 55.90 
Maconesiumycarbonateneeaaenare ac ice Lee nea 43.94 
The eight dolomitic mixtures were likewise made to correspond to the 
four formulas: | 
2.5(CaMg)OSiO,; (CaMg)OA1,0, 
2.0(CaMg)OSiO ,; (CaMg)OA1,0, 
1.5(CaMg)OSiO,; (CaMg)OA1,0, 
1.0(CaMg)O3Si0,; (CaMg)OAI1,O, 
These, of course, were prepared as in the lime series. 
In the table on page 181 the approximate composition of these 
cements is shown. 
