428 EXPERIMENT STATION RECORD, [Vol.87 



The efiPect of fineness of division of pulverized limestone on the yield of 

 crimson clover and lime requirement of soils, N. Kopeloff {Sc-ience, n. aer., 

 45 {1917}, No. 116S, pp. S68-365). — Pot experiments with crimson clover on 

 Iowa, Ohio, and Tennessee silt loams, on Virginia and California sandy loams. 

 and on New Jersey acid muck to determine the influence of calcium oxid and 

 limestone of 20 to 40, 60 to 80, 100 to 200, and 200+ mesh fineness when 

 added in quantities sufficient to satisfy the lime requirement of each soil, as 

 determined by the Veitch method are reported. 



In all the soils there was an increase in the crop as the fineness of the lime- 

 stone was increased. The yields with the 200-raesh limestone were fully one-third 

 larger than those with the 20-mesh limestone. There was little difference be- 

 tween the results obtained with 200-mesh limestone and the calcium oxid. An 

 analysis of the crops showed that as the fineness of the limestone used increased 

 the total nitrogen increased. "The California soil, being decidedly alkaline, re- 

 sponded unfavorably to the application of limestone. The yield of clover as well 

 as the total nitrogen decreased with increasing fineness of division of pulverized 

 limestone. With the acid muck soil, however, the results were similar to those 

 obtained with the other typical soils, 1. e., an increa.se in fineness of division 

 was responsible for an increase in crop yield and total nitrogen." 



Determinations of the lime requirement of the soils after harvesting the 

 clover showed that the lime requirement tended to decrease as the limestone 

 previously applied Increased in fineness. The calcium oxid was not so efliective 

 in this respect as was the 200-mesh limestone. 



Limestones of Michigan, R. A. Smith {Midi, (,'eol. and Biol. Survey Pub. 

 21, Oeol. Ser. 11 {1916), pp. lOSSll, pis. 10, figs. /5).— This report embraces 



(1) a discussion of the character, origin, and classification of limestones; 



(2) an outline of the geology of the limestone formations of Michigan ; (3) their 

 uses; and (4) descriptions of the occurrence, character, development, and eco- 

 nomic possibilities of the limestone beds of the different counties of the State. 



Agricultural lime, M. F. Miller and H. H. Kbvsekopf {Missouri Sta. Bui. 

 146 {1917), pp. 25, figs. 7). — This Is a popular review of experience In liming 

 Missouri soils, with a description of the limestone resources of the State. 



It is stated that approximately two-thirds of the samples of Missouri soils 

 examined at the station have shown more or less need for lime. About one- 

 fourth of these have shown a lime requirement of 2 tons or over per acre to 

 a depth of 7 in. Ground limestone Is considered to be as a rule the cheapest 

 form to apply. 



" Missouri has much limestone suitable for agricultural purposes. The most 

 extensive region of high-grade, high calcium stone extends from southwest 

 Missouri In a northeasterly direction to the Missouri River, spreading out 

 and covering the eastern part of the State both north and South. The Ozark 

 limestones contain much magnesium, and while these are not usually consid- 

 ered so desirable as the high calcium stones they are yet verj' satisfactory for 

 agricultural purposes." 



Tabulated analyses of agricultural lime (Off. Bui. Bd. Agr. Ohio, 8 {1917), 

 No. 1, pp. 62-64). — This section of the report contains the results of actual 

 and guaranteed analyses of 40 samples of limestone, calcium carbonate, quick- 

 lime, and hydrated lime collected for inspection in Ohio during 1916. 



Inspection of commercial fertilizers, 1916, P, F. Trowbridge {Missouri Sta. 

 But. 145 (1917), pp. 41, fig. 1). — This bulletin contains the results of actual and 

 guaranteed analysis of 331 samples of fertilizers and fertilizing materials 

 collected for inspection In Missouri during 191G, together with the results of 

 tests of the relative value of 163 samples of limestone for correcting soil acidity. 

 A list of brands registered for. sale in the State for 1917 is also given. 



