758 EXPERIMENT STATION RECORD. [Vol. 36 



" In an attempt to infect several persons with a single specimen of A. puncti- 

 pennis, one mosquito proved to be the sole infective agent in one experiment, 

 and one proved to be the sole infective agent in three experiments. These two 

 specimens when applied to the same person transmitted the infection in five 

 cases, while one of them used with a third mosquito succeeded in infecting four 

 persons. 



" In these experimental inoculations it was demonstrated that in nine in- 

 stances in which two mosquitoes succeeded in transmitting malaria at least one 

 of the pair was capable of causing the disease when used singly. It was 

 demonstrated in 11 experiments that short exposure to bites was sufficient to 

 cause successful transmission of the disease. In all of the successful inocula- 

 tions only tertian infection was reproduced. P. vivax was demonstrated micro- 

 scopically." 



Wireworm control, J. N. Fkench {Mo. Bui. Com. Eort. Cal, 5 {1016), No. 6, 

 pp. 225-235, figs. 3). — Wireworm injury in the Oxnard district of California is 

 said to be confined from a commercial standpoint almost entirely to the beet and 

 bean crops, $100,000 being a conservative estimate of the damage done during 

 the season of 1914. The injury during 1915, due to the warm weather which 

 prevailed during the growing season and to the control work, was reduced to 

 about half that amount. Hmonius caHfornicus was the most injurious species, 

 though at least three others were found associated with it in some instances. 



The present paper reports upon control work carried on in this district during 

 the years above mentioned. The work with poison baits proved entirely unsatis- 

 factory. In soil fumigation work it was found that a very small dose of cyanid 

 would kill the pest, provided it was put into the soil below the worms and 

 the top of the ground packed to hold the gas, but the destruction in every case 

 was slow, requiring from three to seven days. There was practically no dif- 

 ference in the action of cyanid in solution and that used in the powdered form, 

 and there was comparatively little difference between the results obtained with 

 the stronger doses and with the weaker ones. 



Of the control measures tested, which included the use of poisoned baits and 

 deterrents, soil fumigation, and catch crops against the larva?, fall plowing 

 against the pupfe, and the straw-trap method for the adult, the author has 

 found the straw method of catching the beetles to be the most promising from 

 the standpoint of permanent success. In combating the worm.s, the potato 

 catch crop method is recommended in preference to the cyanid method, because 

 It is much cheaper and has also been more thoroughly worked out and tested 

 on a much larger scale. A combination of the straw-trap method working 

 against the beetles and the potato catch crop method against the worms should 

 be especially effective. 



Powder-post damage by Lyctus beetles to seasoned hardwood, A. D. Hop- 

 kins and T. E. Snyder {U. S. Dept. Agr., Farmers' Bui. 77S {1917)., pp. 20, 

 figs. IS). — This publication describes methods which have been found effective 

 in preventing the losses caused by Lyctus beetles, with a view to inducing a 

 more general adoption of them throughout the country, as well as to show the 

 character and extent of the damage. A revision of the family, including notes 

 on their habits, has previously been noted (E. S. R., 25. p. 261). 



Foul brood reg'ulations, F. B. Paddock {Texas Stn. Circ. 14 {1016), pp. 

 3-5). — These regulations, which supplement those of Circular 11 previously 

 noted (E. S. R., 34, p. 657), became effective on September 1, 1916. 



The Texas foul brood law and foul brood regulations, F. B. Paddock 

 (Texas Sta. Circ. 11 {1916), pp. 20).— This circular brings together the text 

 of the Texas foul brood law and the several regulations since promulgated, 



