afterwards properly aired in strong sunlight. No cure 

 for the disease has so far been discovered. The problem 

 of hereditary infection is of great importance, but I am 

 not aware that any evidence thereon is yet forthcoming. 

 If the queen is capable of transmitting the Nosema 

 parasite to the eggs, the young brood would thus be born 

 infected, and the disease be passed from one generation 

 to another, as happens in the case of the Nosema which 

 causes Pebrine in silkworms. Investigations along these 

 lines are greatly needed. 



LITERATURE BEARING UPON ECONOMIC ZOOLOGY. 



(1) NEWSTEAD, R. The Food of Some British Birds. Su-p-ple- 



f ment to Journal Bd. of Agriculture , vol. xv, igoS (4d.). 



(2) COLLINGE, W. E. The Food of Some British Wild Birds. 



Dulau & Co., 1913 (4/-). 



(3) LEIGH, H. S. Interim Report on The Feeding Habits of the 



Rook. London : His Majesty's Stationery Office, 1915. 



(4) THEOBALD, F. V. Insect Pests of Fruit. Published by the 



Author, Wye Court, Wye, 1909 (i is. ?). 



(5) RUSSELL, E. J., and PETHERBRIDGE, F. R. Partial Steriliza- 



tion of Soil for v Greenhouse Work. Journal Bd. of Agri- 

 culture, vol. xviii, 1912, p. 809. 



(6) THEOBALD, F. V. Injurious and Beneficial Slugs and Snails. 



Journal Bd. of Agriculture,, vol. xi, 1905, pp. 594 and '650. 



(7) THEOBALD, F. V. Second Report on Economic Zoology. 



London : British Museum (Natural History), 1904. 



(8) COLLINGE, W. E. The Economic Importance of Wood-Lice. 



Journal Bd. of Agriculture , vol. xxi, 1914, p. 206. 



(9) CARPENTER, G. H. Insects, their Structure and Life. Dent 



and Co. (4/6). 



(10) MIALL, L. C. Injurious and Useful Insects. Bell & Sons. 



(3/6). 



(n) WILLIAMS, C. B. The Pea Thrips. Annals of Allied. 

 Biology r , vol. i 3 1914-1 $ 3 p. 222. 



(12) Leaflet, No. 10. (Wire Worms). Bd. of Agriculture. 



(Gratis on application.) 



(13) THEOBALD, F. V. First Report on Economic Zoology. 



British Museum (Natural History), 1903. 



