923 



of ]»l;its, 2 ])lats receivino- tlie sainr trcutineiit in every case. The fer- 

 tilizers per iiiae for the ~» series aie — 



Fiisl series 350 iiomuls siij>fr]»h()sj)hate (with ;il>out IG per ceut phosphoric 



acid). 

 Secoiid series., j J^J' P<'">h1s sMperpl.ospLa.e 



( 2o() pounds aiiinionitiiii suljihate. 



( 350 pounds snin-rpliospliate. 

 Third series 2ti5 pounds aniiuonlMni sul])hate. 



( 175 ]i()Muds niuriati' of ]H)tash. 



t 350 pounds suiicrplios])luite. 

 Fourth series... ■ 2t)5 ])ounds anmionium sulphate. 



( 175 pounds rock salt. 

 Fifth series ) ^''*^ pounds superphosphate. 



( 350 pounds nitrate ot soda. 



Wliile barley, sujiar beets, potatoes, or carrots miglitbe used, he sug- 

 gests the ordiuiiry field beets used ibr feeding stock, as these require 

 and readily resjmnd to rich manuring and will be likely to show suffi- 

 ciently large differences in yield between differently manured plats. 



It is hoped that the experiments may be undertaken this season. 



On the source and nature of the coloring matter in grapes, A. 



Gautier {Com pt. rend., 114{ls!);^^),pp. <?^^o'-6'^/'y).— Careful experiments by 

 iMiiiitz* have shown that the removal of leaves just before the ripen- 

 ing of the grapes in a dry season is injurious, the grapes being rela- 

 tively acid, deficient in sugar, and yielding wine of poor color and 

 quality. The author has obtained similar results in experiments of this 

 kind. The fruit was poorly developed, deficient in color, and yielded 

 more readily to attacks of fungous diseases. The main object of his 

 investigations, however, was to determine the source and nature of the 

 coloring matter of the truit. It appears that this is elaborated in the 

 leaves and transferred to the berry at time of ripening, for the removal 

 of leaves about the time of maturity was accomi)anied in every case 

 by a decided etiolation of the berries, and examinations of the leaves 

 revealed the presence in them of the characteristic grape- coloring mat- 

 ter. Analysis showed this coloring matter to be made up princijially 

 of three acids having a composition corresponding to the formulas 

 CiyHjeOio, CnHjeOirt or C26II24OJ5, and CnHisOjo, for which the author 

 l)roposes the names a-ampelochroic, yS-ampelochroic, and ;/-ampelo- 

 chroic. 



• Compt. rend., 114 (1892), pp. 434-437. 



