1094 EXPERIMENT STATION RECORD. 



In combating mosquitoes tlie best results have been oljtained from the use of hydro- 

 cyanio-acid gas, formalin, suljihur fumes, tobacco fumes, and pyrethrum in liouses. 

 Hydrocyanic-acid gas and formalin are preferable, since they are very effective and 

 do not injure fabrics or other materials in houses. 



Attention is called to the importance of draining salt marshes and other stagnant 

 pools of water, as well as the use of kerosene films used in combating mosciuitoes. 

 A table is presented for the purpose of the identification of mosquitoes in New Jersey. 



Apiculture, E. Bertrand {Conduite da rucher. Geneva: li. Bnrkhurdt, 1904, 9. 

 ed., ]tp. :?SS, ])Is. S, fifju. 82). — In this edition the author presents in a revised and 

 corrected form a general account of the sul)ject of apiculture, inchiding the details of 

 management of bees, location of a])iaries, marketing honey, etc. 



Report of the lecturer on apiculture, H. R. Rowsome ( Ontario Ayr. Col. and 

 Exjit. Fartn lipf. 1903, jtp. 159, 160, fi(j». 2). — Experiments were carried on for the 

 purpose of determming the most successful method of storing honey for granulation. 

 For this purpose a tank was constructed of wood held together by clamps. The out- 

 side of the tank was painted to prevent shrinking, and the inside was covered with 

 paraffin. After the honey had granulated the sides were removed, when it was 

 found that the whole mass, weighing one ton, was left in a solid cake. Notes are 

 also given on various methods of hiving bees and other details of management. 



Korean race of silkw^orms, C. Sasaki {Bid. Col. Agr., Tokyo Imp. Univ., 6 {1904), 

 No. 1, 2)p. 21-26, jA. 1). — In studying this race of silkworms the author observed that 

 the fourth larval molt is omitted. The author })elieves that valuable races of silk- 

 worms may l)e obtained by improN-ing certain ijromising varieties of the Korean race. 



The beggar race of silkworms, C. Sasaki {Bui. Col. Agr., Tokyo Imp. Univ., 

 6 {1904), No. 1, pp. 27-31, jigs. 4)- — AVhile this race appears to feed greedily upon 

 withered or otherwise spoiled, as well as fresh, mulberry leaves, the larvte remain as 

 vigorous as those of other races. Notes are given on the quality of raw silk pro- 

 duced by this race. 



Double cocoon race of silkworms, C. Sasaki {BuL Col. Ayr., Tokyo Imp. Univ., 

 6 {1904), No. 1, p>p. 33-35, figs. 8). — The author has observed two varieties of this 

 race, both of which spin yellowish cocoons. It is a vigorous race and easily reared 

 by the native Japanese. The cocoons are ahuost all double, very large, and variable 

 in shape. They usually inclose more than 2 chrysalids and sometimes as many 

 as 8. 



On the feeding of silkworms with the leaves of Cudrania triloba, C. Sasaki 

 {Bid. Col. Ayr., Tokyo Imp. Univ., 6 {1904), No. 1, pp. 15-19, i^s. 2).— Experiments 

 have l)een carried on for a number of years, during which silkworms, especially the 

 race known as Awobiki, were fed on the leaves of C. triloba. Detailed notes are given 

 on the api)earance of the insect during its various stages when fed on these leaves. 



The results obtained from the author's investigations indicate that silkworms fed 

 on this food pass through only four larval stages instead of five, but that the total 

 larval period is about the same as when other materials are used for food. It was 

 noted that if silkworms were fed exclusively on the leaves of C. triloba they ai)peared 

 to be immune to the attacks of parasitic insects. The quality and quantity of fila- 

 ments reeled from cocoons were good. 



On the feeding of silkworms w^ith the leaves of wild and cultivated mul- 

 berry trees, C. Sasaki {Bid. Col. Ayr., Tokyo Imp. Univ., 6 {1904), No. 1, p}p. 

 37-41). — As a result of a number of experiments in feeding silkworms the author 

 concludes that silkworms require the same time for their growth, whether they are 

 fed on wild or c-ultivated mulberry leaves. Those fed on the wild leaves are larger 

 at each stage of growth than those fed on cultivated leaves. The weight and length 

 of silkworms fed on wild leaves are greater than those fed on cultivated leaves. The 



