ECKEL.] 
MICHIGAN. 
197 
j r urnisneu oy the umega Portland Cement Ooni- 
.' pany. 
U'sed by the Omega Portland Cement Company. 
r Furnished by the Omega Portland Cement Com- 
J pany. 
lUsed by the Omega Portland Cement Company. 
(Near Three Rivers. Furnished by Three Rivers 
\ Portland Cement Company. 
fn Ogemaw County. Furnished by Hecla Port- 
land Cement and Coal Company. 
Near Fenton; in Livingston County. 
Moisture and organic matter in air-dried sam- 
ple, 13.95 in first and 4.97 in second analysis. 
{These two analyses show range in composi- 
tion of marl used by Peerless Portland Ce- 
ment Company. 
c 
P 
jAlso: K 2 O=0.17; Na2O=0.52; CO 2 =40.08. 
j Sulphates = trace. From Prospectus German 
I Portland Cement Company. 
{From Goose Lake, Lenawee County. 
Used by the Peninsular Portland Cement Com- 
pany'. 
{In Livingston County. 
Furnished by the Standard Portland Cement 
Company. 
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