72 



important point of attack in the attempts to control the pest, and 

 Levy and Tuck were the first to take advantage of it in their experi- 

 ments. They placed manure in a barrel in the bottom of which several 

 holes had been bored, with the result that on the following day 

 thousands of maggots were found in a tub placed beneath. While 

 these experiments Avere going on the author was also carrying out 

 others, based on the same idea. These experiments clearly demonstrate 

 the habitual nature of the migration and the efficiency of the maggot 

 trap which is designed to take advantage of this mode of action. 

 Whether the trap can be adapted to the handling of manure in a 

 practical way and on a large scale is still a question for further in- 

 vestigation, and problems arise as to how deeply manure may be 

 heaped over such a trap without interfering with migration, and how 

 long the manure must be kept in a trap before it is entirely free from 

 larvae. The period of infestation appears to be rather short, and even 

 under the most favourable conditions maggots will rarely be found in 

 a given lot of manure after 10 or 12 days' exposure. The disposal of 

 the maggots is another practical consideration, the experiments show- 

 ing that 98 or 99 per cent, of the total number can be made to leave 

 the manure, provided it be kept moist ; even from comparatively 

 dry manure as many as 70 per cent, can be destroyed. That the 

 maggot trap possesses certain advantages is obvious and ought to lead 

 to many attempts to develop it along practical lines. Cheapness would 

 be one of its strong points. Incidentally it may be noted that this 

 trap offers a convenient and easy means to the investigator who wishes 

 to collect coprophagous larvae in large numbers. 



Chittenden (F. H.). Concerning Remedies for Chiggers.^J^. Econ. 

 Entom., Concord., vii, no. 1, Feb. 1914, p. 152. 



It has been stated that cattle or sheep are of value in destroying 

 harvest mites {Trombidiiini, sp.) by merely trampling on them. More 

 recently it has been thought that sheep are of more value in this 

 respect than cattle, and it is believed that this is due not only to the 

 fact that sheep keep the grass more closely cropped than would cattle, 

 but that the mites ascend the limbs of the sheep and are killed by the 

 oil in the wool. 



Watson (M.). Malaria and Tropical Agriculture.— T/*op. Agric. Pera- 

 deniya, xHi, no. 2, Feb. 1914, pp. 151-154. 



In this paper the author gives an outhne of work that has been done 

 in connexion with malaria and its relation to the agriculturist. A 

 similar paper has been published in the Trans. Sac. Trop. Med. Hyg., 

 London, vii.. No. 2, Dec. 1913 [see this Review, Ser. B., ii, pp. 46-48]. 



