474 EXPERIMENT STATION RECORD. 



stances varies very much, l)ut where Ijoth the arsenious and arsenic oxids are calcu- 

 lated to arsenic it is found that the percentage of this constituent is fairly constant 

 in different samples." This fact affects the interpretation of the analysis as to the 

 harmfulness of the sample. 



"Wherever a sample contains only a small quantity of soluble arsenious oxid it 

 contains a very large quantity of soluble arsenic oxid, so that the total amount of 

 ansenic that is dissolved from any sample of London purple is very great. This per- 

 haps explains the unaccountable manner in which London purple often scorches the 

 foliage when an analysis has shown that only a small quantity of arsenious oxid is 

 present. . . . Where a large part of the soluble arsenic is present as the calcium 

 salts of arsenious and arsenic acid, as shown by the fact that large amounts of lime 

 also go into solution, it appears that plants canendtire much more of these salts than 

 they can of the free acids. Work along this line is nmch needed." 



Remedies and formul'as adopted by the State board of horticulture for 

 the extermination of pests injurious to tree and plant life ( Colorado State 

 Bd. lIoH. T\/it. 1901, pp. 273-ii92) . — Notes are given on the formulas and methods of 

 preparing the common insecticides, such as Paris green, London purple, white 

 arsenic, arsenic bran mash, white hellebore, Bordeaux mixture, kerosene emulsion, 

 resin wash, lime-salt-and-sulphur wash, and whale-oil soap. A brief description, 

 together with remedies, is given for the chief insect enemies of apple, pear, plum, 

 peach, small fruits, shade trees, roses, and other farm and garden crops. 



An index to Bulletins Nos. 1-30 (new series) (1896-1901) of the Division 

 of Entomology, N. Banks ( V. S. Dept. Agr., Division of Eidomology Bui. 36, n. ser., 

 pp. 64). — In this bulletin the author has compiled an index of authors, illustrations, 

 species of insects, and subjects which are included in Division of Entomology Bulle- 

 tins 1-30, new series. 



Report of the twenty-second annual convention of the Colorado State 

 Beekeepers' Association [Colorado State Bd. Hort. Rpt. 1901, pp. 309-4^0, pi. 1). — 

 The twenty-second session of this association was held at the State capitol building, 

 Denver, Colo., November 18 to 20, 1901. A number of brief papers were read on 

 various subjects, including methods of killing ants, grading honey, breeding bees, 

 growing basswood for bee food, the construction of a honey house, honey pasturage, 

 abnormal swarming, spring management, the extraction of honey, and long-tongued 

 bees. 



Studies on the silkworm during the pupal condition, R. Dubois and E. 

 CouvREUR [Ann. Soc. Linn. Lyon, n. ser., 4S {1901) , pp. 157-163). — The investigations 

 reported in this paper were chiefly concerned with the elimination of carbonic acid 

 and water from the pupje, the influence of the presence or absence of the cocoon on 

 the rapidity of the metamorphosis of the pupse, and the influence of carbonic acid on 

 the spinning powers of the larva^. It was found that during the 3 days in which 

 the larva spins the cocoon a large quantity of carbonic acid and water vapor was 

 excreted, while after this period the carbonic acid accumulated to a considerable 

 extent in the tissues. 



FOODS— NUTRITION. 



Dietary studies in New York City in 1896 and 1897, W. 0. Atwater and 

 A. P. Bryant {U. S. Dept. Agr., Office of Experiment Stations Bid. 116, pp. 83).— The 

 results of 36 dietary studies carried on in the thickly congested districts of New York 

 City are reported. In some cases the families had a fairly large income, but most of 

 them were of the sort receiving frequent assistance from charitable organizations. 

 For convenience in discussing the results the families were divided into 6 groups, 

 viz, those in which the cost of the daily diet per man (1) was less than 13 cts., (2) 



