804 EXPERIMENT STATION RECORD. 



crystals and in their beliavior toward reagents and solvents. Working on tbis 

 basis it is shown that in the leaves of XJ. dioica two coloring matters were 

 noted, namely, carotin and xanthophyll. This finding has been previously noted 

 by Willstiitter and Mieg. 



D. thyrsiflorum contains two carotinoids. One of these is reddish orange in 

 color and does not grow commonly in plants. The author believes that this 

 substance is not a true carotinoid and belongs to the xanthophylls. 



In H. jjluvialis two carotinoids occur. This finding was previously made by 

 Zopf but the procedures used by the two investigators were different. 



The sugars and their simple derivatives, J. E. Mackenzie (London and 

 Edinburgh, 1913, pp. XVI-\-242, figs. i7).— The contents of this book are based 

 on a course of lectures given at Birkbeck College, London, in 1903 and subse- 

 quently at the University of Edinburgh before students of pure chemistry, 

 medicine, brewing and distilling, and sugar manufacture. The book is intended 

 as a companion to works on physiological chemistry and to chemo-technological 

 works. 



Its contents include sugars; synthetic methods of preparation; manufacture 

 of sucrose from the sugar cane and sugar beet; physical and chemical pi'operties 

 of sucrose; maltose; lactose; glucose; glucosamin; configuration: pentoses; 

 methyl pentoses; aldohexoses; ketohexoses; disaccharids, trisaccharids, and 

 tetrasaccharids; glucosids; fermentation; and metabolism. 



The differentiation and specificity of starches in relation to genera, spe- 

 cies, etc.. E. T. Reichekt (Carnegie Jnst. Washington Pub. 173. 1913, pis. 1, 

 pp. XyiI+342+20, pis. 102; 2, pp. XVIJ-{-3Jf.3-900-\-18, figs. 4OO).— This is a 

 preliminary report of an attempt to apply stereo-chemical principles to proto- 

 plasmic processes and products and to serve as a strictly scientific basis for the 

 classification of iilants and animals. It is a supplement to the report on the 

 crystallography of hemoglobins by the same author (E. S. R., 22. p. 701). 



The work deals with the literature pertaining to the starch grain, and also gi\ es 

 the histological appearance and behavior of the starches from many sources. 

 Among Ihe methods used were tests with iodin, anilin dyes, swelling reagents, 

 the polariscope with and without the selenite plate, and gelatinization. In 

 addition to this, curves of the reaction intensities and the histology of different 

 starches were noted. Six hundred and twelve micro-photographs of starches 

 are shown and the applicability of the results of the research to pharmacognosy, 

 pharmacodynamics, systematic botany, and commercial pursuits is discussed. 



Glycerids of butter fat, C. Ambebger (Ztsehr. Untcrsueh. Xahr. u. Ge- 

 nussmtl., 26 (1913), No. 2, pp. 65-S5). — By fractional solution and crystalliza- 

 tion pure individual glycerids can be obtained from butter fat. The least solu- 

 ble glycerid, i. e.. in ether, obtained from one fat consisted of tristearin (not 

 quite pure), and from two others, palmityl-distearin. From another sample of 

 butter a stearyl-dipalmitin was obtained. 



The density and solution volume of some proteins, Harriette Chick aud 

 C. J. Martin (Diochcm. Jour.. 7 (1913), Xo. 1, pp. 92-96). — "A comparison has 

 been instituted in case of four proteins, viz, caseinogen, egg and serum albumins, 

 and serum globulin, between the density directly determined with dry speci- 

 mens and that calculated from the specific gravity of concentrated solutions. 

 The latter is found to be 5 to 8 per cent in excess of the former, showing the 

 extent of shrinkage in volume taking place when these proteins enter colloidal 

 solution." 



For previous work see other notes (E. S, R.. 29. p. 501). 



The factors concerned in the solution and precipitation of euglobulin. 

 Harriette Chick (Bioehem. Jour., 7 (1913), Xo. 3, pp. 31S-3-'fO). — "The iso- 

 electric point for euglobulin has been redetermined and found to coincide with 



