FIEIJ) CROPS. 1033 



ro.'ulily decomposod by an associated enzyiii yielding acid. A number of tbese 

 yliicosids jire mentioned and tbeir diemical formnlas and reactions are given. 

 Among tbose described .-ire aiiiy,i,'dalin, man(leli<- nitrile glncosid, sambunigrin, 

 prulaurasin, dburrin, lotusin, i»haseolunatin, etc. Among the enzynis asso- 

 ciated with these glucosids the authors briefly characterize emulsin, lotase, 

 gynocardase. and maltase. The i)liysiological significance of cyanogeuesis is 

 discussed at considerable lengtli. 



The translocation of essential oils, E. Ciiarauot and G. Laloue (Compt. 

 h'rtnl. Acdd. Sri. \J'(iri.^\. t ', ', (IH07), No. 15, pp. H0S-810).—A study was made 

 of \'crh('iia triplnjUa to determine tlie translncalion of tlie essential oils due to 

 differences in the age of the i>lants. 



Fifty plants at the beginning of flowering were subjected to distillation, the 

 essential oil from the roots, stems, leaves, and intlorescences being collec-ted 

 separately. An average of 337 mg. of essential oil for each plant was obtained, 

 distributed in the different parts as foUovv'S : Roots 10 mg., stems 8 mg., leaves 

 242 mg.. Inflorescences 77 mg. A few weeks later, after flowering had ceased, 

 a similar lot of plants was examined, and the amount of essential oil found 

 was 280 mg. per plant, of which 10 mg. occurred in the roots, 1(3 mg, in the 

 stems, 192 mg. in the leaves, and 50 mg. in the inflorescences. During the 

 period of about 3 weeks there had been a considerable translocation of essential 

 oil, as shown by the increase in the roots and stems, but a total loss of .il mg., 

 which loss is attributed to the utilization by the plant of the essential oils in 

 ripening its fruit. 



The weeds of the Province of Prince Edward Island, AY. Lochhead 

 {Prince Edward Isl. Agr. Rpt., 3 {1906), App., pp. I-XXVII, pis. i8).— Illus- 

 trated descriptive notes are given on a number of the more troublesome weeds, 

 with suggestions for their eradication. 



FIELD CROPS. 



Annual report of the Porto Rico Experiment Station for 1906 [Field crops], 

 D. W. May {Porto Rico Sta. Rpt. 1906, pp. 5-17). — The progress made in the 

 culture of tobacco, coffee, sugar cane, cotton, rice, forage crops, and fiber plants 

 at the station and in the island are briefly described. The possibilities of a 

 profitable production of these crops in the island, tbeir requirements, and the 

 jiresent state of their culture are discussed. 



Demonstration farms, E. G. Schollandeb {Xorth Dakota Sta. Rpt. 1906, pt. 

 1, pp. 6'6'-.s'.0 ) . — This report maps out the woi'k for a period of 5 years and gives 

 the results obtained the first season on demonstration farms in the State. 

 The object of the work is to determine in each case what crop rotation is best 

 adapted to that i)articular neighborhood, to build up the fertility of the soil by 

 substituting field corn and clover for summer fallowing, and to preserve the mois- 

 ture and clean the land l)y e.xtra tillage. 



'IMie results of soil moisture determinations and (be rainf.-iU and frost records 

 at different points are given in tables. 



Crop work at the northern substation farms, 11. A. Moori: and E. .T. Del- 

 wiciiE {Wi.<ico)i-<iiii Sta. Rpt. 1906, pp. 275-280, figs. 5).— Swedish Select oats at 

 Iron River yielded 27 bu. per acre, weighing 38.G lbs. per measured bushel, and 

 barley 26 bu., weighing 49.2 lbs. Coru was fully matured before October 5, 

 before heavy frost, and gave a total yield of 18,.'i00 lbs. per acre, the grain 

 amounting to 47.7 bu. of shelled corn. An early variety of soy beans produced 

 2 tons per acre of well-cured hay, and a row left in the field produced a good 

 quality of well-ripened beans before frost. One-fourth acre of Kleinwanzleben 

 sugar beets yielded at the rate of 9 tons per acre, and showed a test of 93.3 iu 



