135 
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) NewstTeaD, R.—The Food of Some British Birds. Supfle- 
ment to Journal Bd. of Agriculture, vol. xv, 1908 (4d.). 
(2) CoLtincE, W. E.—The Food of Some British Wild Birds. 
Dulau & Co., 1913 (4/-). 
(3) LercH, 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 (£1 Is. ?). 
{5) RUSSELL, E. J., and PETHERBRIDGE, F. R.—Partial Steriliza- 
tion of Soil for Greenhouse Work.—/ournal Bd. of Agri- 
culture, vol. xviii, 1912, p. 8009. 
(6) THEOBALD, F. V.—Injurious and Beneficial Slugs and Snails. 
Journal Bd. of Agriculiure, vol: xi, 1905, pp. 504 and 650. 
(7) THEOBALD, F. V.—Second Report on Economic Zoology. 
London: British Museum (Natural History), 1904. 
{8) Contince, W. E.—The Economic Importance of Wood-Lice. 
Journal Bd. of Agriculture, vol. xxi, 1914, p. 206. 
(9) CarRPENTER, G. H.—lInsects, their Structure and Life. Dent 
and Co. (4/6). 
(10) Matt, L. C.—Injurious and Useful Insects. Bell & Sons. 
(3/6). 
(11) Witiams, C. B.—The Pea Thrips. Annals of Applied 
Biology, vol. i, 1914-15, Pp. 222. 
{12) Leaflet, No. 10. (Wire Worms). &d. of Agriculture. 
‘Gratis on application.) 
(73) THEOBALD, F. V.—First Report on Economic Zoology. 
British Museum (Natural History), 1903. 
