Physiologie der Zellen, Gewebe und Organe. 137 



phate, containing respectively 0,70 and 0,94 pound of digestible protein, and 

 yielding respectively 4,28 and 4,49 therms of metabolizable energy per 100 pounds 

 live weight, are sufficient for the normal nutrition of yoimg, growing pigs. The 

 difference between 0,70 and 0,94 pound digestible protein and 4,26 and 4,29 therms 

 of metabolizable energy per 100 pounds live weight per day in a ration con- 

 sisting of ground corn, blood meal, and an ample amount of calcium phosphate 

 does not exert any apparent effect upon the nutrition of young growing pigs. 



Pearl. 



342) Lewis, H. R., The Ash and Protein Factoi in Poultry Feeding. 

 In: New Jersey Agr. Expt. Sta. Bull. No. 264, S. 1—176, Dec. 1913. 



In this paper are reported the results of experiments in studying the effect 

 of varying amounts of protein and ash from different sources when fed to poultry 

 of different ages and for different purposes. It was found that protein from a 

 vegetable source, even when accompanied by a high phosphoric acid content in 

 the ration, is not an efficient method of providing protein when feeding growing 

 chickens or laying flocks. The addition of animal protein in the form of meat 

 scrap materially increases the efficiency of a ration relatively high in vegetable 

 protein, both for egg production and for flesh growth. And increased consump- 

 tion of nitrogen occasioned by the addition of meat scrap, does not cause in- 

 creased loss of nitrogen in the feces, the reverse, however, being true. The per- 

 centage of nitrogen is slightly less owing to the fact that nitrogen from an animal 

 source has a slightly higher coefficient of digestion due in part to a material 

 increase in its palatability. Phosphoric acid from an organic source (animal bone) 

 is much more efficient than phosphoric acid from an inorganic source. The ef- 

 ficiency of bone is measured in two ways, first, its increased assimilation as shown 

 by the small percentage of phosphoric acid found in the feces where bone was 

 used; and second, from the fact of its value in increasing the percentage of 

 nitrogen assimilated as shown by the small percentage of nitrogen in the feces 

 where bone and meat were fed together. Lime in itself has little or no effect 

 upon increasing assimilation of nitrogen. Pearl. 



343) Gile, P. L. and Carrero, J. 0., Assimilation of Colloidal Iron by 

 Rice. In: Journ. Agr. Research, Vol. III, No. 3, S. 205—210, Dec. 1914. 



The work reported would seem to show that rice can not assimilate col- 

 loidal iron. It is believed that the iron obtained from dialyzed-iron prepa- 

 ration was soluble iron. It is apparent that the toxicity of ordinary distilled 

 water or ferric-chlorid Solutions for plant roots can not be overcome by sup- 

 plying other roots of the same plant with a balanced Solution. The toxicity of 

 the ferric-chlorid Solution was accompanied by the penetration of iron into the 

 root and transportation to the leaves. Pearl. 



344) Allard, H. A., Effect of Dilution upon the Infectivity of the 

 Virus of the Mosaic Disease of Tobacco. In: Jour. Agr. Research, Vol. III, 

 No. 4, S. 295—299, Jan. 1915. 



The virus of the mosaic disease when diluted to 1 part in 1000 water is 

 quite as effective in producing infection as the original undiluted virus. Atte- 

 nuation of the virus is indicated in dilutions of 1 part in 10000 of water. At 

 greater dilutions infection is not likely to occur. All evidence at hand indicates 

 that something is present in the virus of the mosaic disease which is extraneous 

 to the protoplasmic Organization of healthy plants. This plants and interferes 

 with normal nutrition and growth. Although enzymic activities have been con- 



