REVIEWS 543 



Blatchley, W. S., and Ashley, G. H. The Lakes of Northern Indiana 

 and their Associated Marl Deposits. Twenty-fifth Ann. Rept. Indiana 

 Dept. Geology and Natural Resources. Pp. 31-321, Pis. 1 and 6-12, 

 Figs. 1-70, 1901. 



The origin and uses of marl are first discussed, issue being taken with C. A. Davis 

 on some points connected with the importance of Characae in the formation of marl 

 deposits. The marl deposits of the state are then discussed separately in great detail. 



Marl deposits of sufficient size to justify the erection of cement plants occur in Indi- 

 ana only in the three northern tiers of counties. Areally, the largest of these deposits 

 is in Lake Wawasee, which contains about 1,700 acres, while the maximum thickness 

 (45 feet) is reported from Turkey Lake, Lagrange co. A deposit of marl equal to one 

 covering 160 acres, ten feet thick, will supply for thirty years a plant with a capacity 

 of 500 barrels per day Deposits of such size are termed "workable deposits" in the 

 present report. Thirty-two such deposits were found and are described and mapped 

 in detail. A number of other deposits are described which, though of sufficient size, 

 have the larger part of their area covered by ten feet or more of water and are there- 

 fore not at present workable. Improved appliances for raising marl from beneath 

 such depths of water would render these deposits available. 

 Blatchley, W. S. Portland Cement. Twenty-fifth Ann. Rept. Indiana 



Dept. Geology and Natural Resources. Pp. 1-30, Pis. 2-5, 1901. 



A summary of the history, uses, composition, manufacture, and testing of Portland 

 cement is followed by a brief history of the industry in Indiana. 



Portland cement was first manufactured in Indiana at South Bend in 1877, from 

 marl and clay burned in dome kilns. Operated with varying fortune, this plant was 

 shut down finally in 1898. Two plants, also using marl and clay, but burning the 

 mixture in rotary kilns, commenced operations in 1900, and at the time of report three 

 additional plants were in prospect. 



Cummings, Uriah. \_Production of] American Rock Cement [in the U. S. 

 during i8qq\ Twenty-first Ann. Rept. U. S. Geol. Surv., Pt. VI con- 

 tinued, pp. 407-41 1, 1901 . 



Resume of the condition of the American natural cement industry during 1899, 

 with statistics of production. Analyses and tests are quoted of a Portland cement 

 manufactured at Chattanooga, Tenn., by burning a natural rock without admixture. 



Eckel, E. C. The Portland Cement Industry in New York. Engineering 



News, Vol. XLV, pp. 365-367, 1901. 



Resume of early history of Portland cement manufacture in New York, with 

 descriptions of the six plants operating in 1900, and notes on the technology. 



Until recently most New York plants used a mixture of marl and clay, burned in 

 dome kilns. At present, however, the use of rotary kilns, operating on mixtures of 

 hard limestone and clay, is increasing rapidly, half the plants in operation in 1900 

 being of this type. 



Slag Cement Manufacture in Alabama. Eng. News, Vol. XL VI I, pp. 

 1-62, 1902. 



Description of two slag cement plants operating in Alabama, with notes on 

 technology of slag cement in general. 



