718 



potash did the nitrate prove that it caused an increase sufficient to pay 

 for its purchase and use." The author suggests that the previous crop 

 " doubtless afforded a rather large supply of nitrogen, and rendered 

 useless the application of nitrate of soda." 



"The State Grange has asked to have these experiments continued 

 next year. If they are regarded as object lessons laud owners and 

 fertilizer manufacturers will both profit by the work." 



Delaware Station, Bulletin No. 12, March, 1891 (pp. 28). 



Injurious insects and insecticides, M. H. Beckwith (illus- 

 trated). — Notes on the black peach aphis {Aphis persicce-niger), syniug 

 canker-worm {Paleacrita vernata), rose-chafer [Macrodactylus subspi- 

 nosus), harlequin cabbage bug {Miirgantia histrionica), cut-worms, and 

 angoumois grain-moth [Sitotroga cerealella), with suggestions as to rem- 

 edies, and brief accounts of experimonts with insecticides. Kerosene 

 emulsion was successfuly used for the black peach aphis and rose- 

 chafer, as well as for the black flea beetle ( Crepidodera cucumeris). Tab- 

 ulated details are given for an exiieriment in which 16 apple-trees were 

 treated with London purple and 18 with Paris green for the codling moth. 

 The best results were obtained by spraying three times, using the arsen- 

 ites at the rate of 1 pound to 200 gallons of water, under which con- 

 ditions there was practically no difference in the effectiveness of the 

 two insecticides. Brief directions are given for the use of London 

 purple, Paris green, white hellebore, kerosene emulsion, and tobacco 

 decoction. Spraying machinery is described and illustrated. 



Iowa Station, Bulletin No. 12, February, 1891 (pp. 58). 



Experiments with potatoes, R. P. Speer (pp. 507-518).— Brief 

 accounts are given of field and greenhouse experiments with whole 

 potatoes, pieces of different sizes, "nubs," and immature potatoes as 

 seed. Analyses by G. E. Patrick, M. S., the station chemist, as tab- 

 ulated, show a larger amount of albuminoids in the seed ends than in 

 the stem ends of potatoes, and in ripe than in unripe potatoes or nubs. 

 The experiments and analyses enforce the importance of selecting 

 mature potatoes of good size and quality for seed. 



Sugar-beets, G. E. Patrick, M. S., and E. N. Eaton, B. S. (pp. 

 519-529). — The experiments in 1890 were in continuation of those 

 reported in Bulletin No. 8 of the station (See Experiment Station Record, 

 Vol. II, p. 54). Tabulated data, including description of samples, reports 

 on soil and culture, per cent of sugar (sucrose) in beets and in juice, 

 purity co-efficient, etc., are given for 34 samples of sugar-beets grown 

 at the station and elsewhere in Iowa. Only five of the samples con- 

 tained more than 13 per cent of sucrose, while eight contained over 12 

 per cent. Analyses of 14 samples received from Nebraska are also 

 given. These averaged 13.2 per cent of sucrose in the beets. With a 



