676 EXPERIMENT STATION RECORD. 



The blue stone is sometimes impure owing to tlie presence of sulphate of iron. 

 Iron vessels should be avoided as containers for this mixture ; wooden vessels are 

 preferable. 



In making lime, salt, and sulphur wash, the sulphur may be thoroughly incorpo- 

 rated by first grinding it up into a paste with a small quantity of water. The best 

 vessel for boiling the mixture is an enameled one. 



Speaking of kerosene emulsion he states that free oil is injurious to foliage and 

 that it attacks India rubber; hence it is necessary to wash out the spraying appa- 

 ratus with hot water after use. 



Spraying fruit trees -with Paris green as a remedy against larvae, W. M. 

 Sciioyen (Ent. Tidslr., 12 (1896), pp. 816-220). 



Insecticides and fungicides, a guide to their application in agriculture and 

 horticulture, W. M. Sciioyen (Lnsekt- o<j sopfordnvende Midler. Christiania: Grondahl 

 #Son, 1896, pp. 16). 



A simple and cheap apparatus for making kerosene emulsion. W. M. Schoyen 

 (Norsk Eavetidende, 18 (1897), No. 4, pp. 56-58). 



Caution against the use of kerosene in the treatment of Pediculosis capitis, 

 M. E. Paul (Lancet [London], 2 (1807), No. SS74, p. 1385).— The caution is against the 

 danger of fire. A case is cited in which death was brought about not from the hair 

 becoming ignited from a naked light, but, as explained by Lord Kelvin, from an 

 explosive mixture of air and kerosene vapor having been formed in the interstices 

 of the hair which was ignited by an electric spark produced by friction of the hair. 



A new application of carbid of calcium, E. Chuard (Chrov. Agr. Cant. Vaud, 9 

 (1890), pp. 207-209.) — The author notes briefly the peculiarities of this substance, its 

 production from acetylene, during the evolution of which the carbid becomes trans- 

 formed to quicklime aud later to slacked lime, if there is suflicient water present. 

 As acetylene has insecticidal properties, he points out that one has in carbid of 

 calcium a substance that may be used as an insecticide and at the same time serve 

 as a mineral manure. 



Rorig's lamp for the destruction of insects (Set. Amer. Sup. 44 (1897), No. 1135, 

 p. lS145,fiij. l,from La Nature). — This inexpensive apparatus consists of a hexagonal 

 lantern tapering pyramidally above and below, inclosing a lamp and provided with 

 6 apertures and as many strong lenses, each preceded with a conical reflector, 

 through which insects attracted by the light may enter. The pyramidal top is pro- 

 vided with ventilators that allow proper ventilation without permitting the escape 

 of the insects. These are attracted below by a saccharine or odoriferous mixture 

 contained in a department in the pyramidal base. At the bottom of this base is a 

 large receptacle into which the insects fall and from which they may be gathered 

 from time to time. 



The diameter of the lantern is 0.31 meter; the sides 0.15 meter square. The front 

 aperture is 0.13 meter. The apparatus is supposed to be placed in a field or in a tree. 



Foul brood, Pickle brood or new disease, E. S. L< >yesy (Amer. Bee Jour., 37 (1897), 

 No. 27, p. 419). — A bee disease is noted as occurring in Utah that resembles foul 

 brood sufficiently to bo sometimes mistaken for it; but, according to the author, is 

 distinguished from it by a number of peculiarities. It first made its appearance in 

 the spring of 1896 aud spread with great rapidity — more so than foul brood — from 

 hive to hive and from one locality to another. There appears to be no doubt that it 

 is contagious. It difi'ers from foul brood in lacking the offensive smell of that dis- 

 ease and in not having the stringy or coffee-colored appearance so characteristic of 

 foul brood. It is strictly a disease of the brood, the larva' dying when nearly full 

 grown and merely shriveling Tip. When they roach about the size of house flies 

 they are removed from the cells and cast out of the hive. They may usually be 

 drawn from the cell whole, an impossible tiling in foul brood. 



According to the author's experience the disease ebbs and flows with the condition 

 of the swarm attacked. A vigorous swarm is seldom attacked. Transferring to a 

 clean hive aud foundation acts as a cure, and the same result, it is said, may be 

 obtained by sprinkling bees aud comb with fine dried salt. The latter remedy is 

 also recommended for holding foul brood in check. 



