576 



EXPERIMENT STATION RECORD. 



article by the same author iu U. S. Dept. Agr., Division of Entomology Bulletin 7, 

 an abstract of which will be given later. 



Fir-tree oil as an insecticide, W. G. Sturgis (dard. and Forest, 10 (1897), No. 487, 

 p. 249). — Notes are given on the use of fir-tree oil against certain insects not amenable 

 to insecticides. A species of aphis, the larvae of 1 or more species of Cacorcia, and 

 a leaf hopper were parasitic upon hardy roses in the viciuity of New Haven, Con- 

 necticut. After a 2 years' trial with various decoctions and powdery applications 

 the author declares that "for general utility, thorough effectiveness, ease of appli- 

 cation, and cleanliness," nothing equals fir-tree oil. 



Foul brood and its treatment, T. W. Cowan (Rev. Internat. Apiculture, 19 (1S97), 

 No. 6, pp. 98-103, fig. 1).— This is translated into French from the fourteenth edition 

 of Cowan's guide for the English beekeeper. Cowan recommends the thorough dis- 

 infection of hives and utensils. When a diseased hive is to be treated and not 

 destroyed he recommends that the hive be washed out with phenol (phenol 2 tea- 

 spoonfuls, water £ gal.) and the diseased brood frames sprayed with a weaker solu- 

 tion (i teaspoonful to \ gal. of water). From other frames the honey is to be 

 extracted and boiled and the frame treated like the brood frames. The bees are to 

 be fed a sirup containing phenol at the rate of \ teaspoonful to \ gal. of sirup. If 

 it is accepted by the bees more phenol should be added. 



On fungi living upon insects, G. Lindau (Ent. Nachr., IS (1S97), No. 15, pp. 225-230, 

 fill- !)■ 



FOODS— ANIMAL PRODUCTION. 



The effect of adding increasing amounts of fat upon the digesti- 

 bility of rations, A. Wicke arnd II. Weiske (Landw. Vers. Stat., 48 

 (1897), No. 6, pp. 390-400). — The author made experiments similar to 

 those previously reported (E. S. R., 8, pp. 321, 610, G17) to study the 

 effect of adding increasing quantities of fat to the rations of sheep. 

 The test which was divided iuto 4 periods of 7, G, G, and 5 days each, 

 was made with 2 sheep weighing about GO and 57 kg., respectively. 

 The basal ration of sheep Xo 1 consisted of 1,000 gm. meadow hay and 

 250 gm. linseed cake; and of sheep No. 2, 750 gm. meadow hay and 250 

 gm. linseed cake. In addition sheep Xo. 1 was given 60, 120, and 180 

 gm. of olive oil in the second, third, and fourth periods, respectively, and 

 during the same periods Xo. 2 was given 50, 100, and 150 gm. olive oil. 

 The coefficients of digestibility in the different periods were as follows: 



Results of digestion experiments with sheep. 



