758 EXPERIMENT STATION RECORD. 



Helorus sp. C. oompressicornis, in addition to having been reared frequently 

 from clarysopids, was reared on one occasion from an undetermined syrphid 

 pupa. Pachyneuron allograptw and Syrphophagus nresograptce were also reared 

 from the same syrphid species. 



The economic importance of wood lice, W. E. Collinge {Jour. Bd. Agr. 

 [Lorid07i], 21 (1914), No. 3, pp. 206-212, pi. i).— Of 35 species found in the 

 British Isles not more than nine or ten are sufficiently common to be of economic 

 importance. The commonest and most numerous of these species, which are 

 here discussed, are Trichoniscus roseus, Oniscus asellns, PorcelUo scaber, P. 

 pictus, P. Icevis, PorcelUonides pruinosus, and ArmadUUdium milgare. 



The rust mite and its control, W. W. Tothers (Proc. Fla. State Hart. »S'oc-., 

 27 {191Jf), pp. 115-119).— A brief account is first given of the life history of this 

 mite, which is known to occur in California, Hawaii, Mexico, Jamaica, Cuba, 

 and Australia, as well as Florida. It is said to have been recorded also from 

 rhiladeli)biu and New York, where it undoubtedly infested citrus trees growing 

 in greenhouses. While citrus fruits and trees are given in the literature as the 

 only food plants, the author reports having found a mite on roses which re- 

 sembles the rust mite of the orange. 



The author's investigations lead him to conclude that a reduction in the size 

 of oranges close to 25 i>er cent of the total crop is caused by this mite. He 

 states that a sulphur soda solution consisting of sulphur 30 lbs., caustic soda 

 (98 per cent) 20 lbs., and water 20 gal. applied at the rate of 1:60 or 1:06 

 will kill the mites and that a dilution of 1 : 40 will destroy the egg. 



The data relating to lime-sulphur have been noted from another source 

 (E, S. R., 31, p. 549). 



A mixture consisting of 1 lb. flowers of sulphur and 2 lbs. of hydrated lime 

 ;ipplied frequently with a dusting machine is also reported to have given satis- 

 factory results. 



New observations on the biology of Fasciola hepatica, D. Ssinitzin 

 (Centhl. Bald, [etc], 1. Abt., Orig.. 74 (19H). No. 3-4. pp. 280-285. figs. 3).— 

 The author reports that he was unable to find young distomes in the liver of 

 rabbits during the first four days following infection but that they were always 

 found in the abdominal cavity. 



FOODS— HUMAN NUTEITION. 



Studies on chicken fat, — VI, The factors influencing the acid value of the 

 crude fat, MIary E. Pennington, J. S. Hepburn, and E. L. Connolly {Proc. 

 Amer. Soc. Biol. Chem., 3 (1913), No. 1, p. 38). — A summary of a paper presented 

 at the eighth annual meeting of the American Society of Biological Chemists 

 at Philadelphia, Pa., December, 1913, and continuing previous work (E. S. R., 

 28, p. 63). 



According to the authors, "low temperatures tend to retard the hydrolysis 

 of the fat. The acidity is influenced to some extent by the quantity of fat. 

 expressed as percentage of the body weight ; other conditions being equal, a 

 large quantity of fat is usually accompanied by a low acid value and vice versa. 

 The acidity is also dependent on the degree of activity of the lipase. The de- 

 gree of saturation of the fatty acids, measured by the iodin number, and the 

 titer of the insoluble fatty acids, apparently, are without influence on the 

 acidity. 



"The study reported would tend to confirm the reliability of the acidity of 

 crude chicken fat as an index of decomposition. The Influence exerted by the 

 various factors, lust enumerated, while of interest from the viewpoint of ac- 

 quiring knowledge of bloc-hemical processes and especially of those relating to 



