520 EXPERIMENT STATION RECORD. 



rials had but little effect on the cane. Heavier applications seemed to produce 

 quite notable increases in tonnage but at a prohibitive cost. 



Lime-induced chlorosis, P. L. Gile and J. O. Caerero (Porto Rico 8ta. Rpt. 

 1914, pp. 15, 16). — Brief reference is made to experiments with rice similar to 

 and in extension of previous experiments with pineapples (E. S. R., 2G, p. 121 ; 

 31, p. 816). In these experiments an attempt was made to determine whether 

 the action of calcium carbonate in inducing chlorosis is due solely to its depress- 

 ing effect upon the assimilation of iron. 



When ferrous sulphate was applied to chlorotic rice grown in calcareous soils 

 it was found that " the results were similar to those obtained in previous work 

 with pineapples. Ferrous sulphate applied to the leaves as a spray restored the 

 green color and induced a normal growth, but applied to the soil was without 

 effect." 



Various other experiments bearing on the causes of chlorosis are referred to 

 as in progress but no results are reported. 



The purification of waste liquors from paper mills, G. B. Kershaw (Sur- 

 veyor, Ifi (1915), No. 1199, pp. 28-30).— The author states that in the treatment 

 of waste waters from paper mills large amounts of sludge are obtained which 

 may be used for manuring purposes as it contains considerable lime. 



Commercial fertilizers, W. J. Jones, Jr., et al. (Indiana Sta. Bui. 180 (1915), 

 pp. 401-520). — This bulletin gives the results of the fertilizer inspection, includ- 

 ing analyses and valuations of 1,420 samples collected in Indiana during the 

 spring and fall of 1914. A list of brands registered since i\Iay 15, 1914, and 

 brands previously registered, to be on sale in 1915, and other data are also 

 given. 



Analyses of commercial fertilizers, P. H. Wessels et al. (Rhode Island Sta. 

 Insp. Bui., 1914, Sept., pp. ^-8). — This bulletin contains analyses and valuations 

 of 50 samples of high-grade fertilizers and fertilizing materials collected in 

 Rhode Island during the spring of 1914. It is stated that nearly two-thirds 

 of the total number of brands listed fell below their guaranties as regards 

 water-soluble phosphoric acid and about one-half are deficient in available phos- 

 phoric acid. 



Analyses of commercial fertilizers, P. H. Wessels et al, (Rhode Island Sta. 

 Insp. Bui., 1914, Oct., pp. 3-11). — This bulletin contains analyses and valuations 

 of 21 samples of limes and wood ashes collected in Rhode Island during 1914 

 and of 33 samples of complete fertilizers not reported in previous bulletins, 

 together with a summary of results for the year. This last indicates that 

 " in 82 per cent of the instances reported the amounts of nitrogen, potash, 

 and total and available phosphoric acid were equal to or above the amounts 

 that were guarantied, in 9 per cent the amounts were less than 0.3 per cent 

 below the amounts that were guarantied, and in 9 per cent the amounts were 

 more than 0.3 per cent below the guaranties." 



AGRICULTURAL BOTANY. 



An experimental study of the rest period in plants: Seeds, W. L. Howard 

 (Missouri Sta. Research Bui. 11 (1915), pp. 58). — In continuation of other 

 investigations on the rest period of plants (E. S. R., 33, p. 223), the author 

 gives an account of studies carried on with seeds, begun in 1907 and continued 

 for seven years. 



In the preliminary tests it was found that seeds of many annual plants 

 were able to germinate while quite immature, but that more than half the 

 species investigated had a pronounced rest period. Of the species having a 

 definite rest period by far the greater percentage are woody plants. The in- 



