135 



afterwards properly aired m strong sunlight. Xo cure 

 for the disease has so far been discovered. The problem 

 of hereditary infection is of great importance, but 1 am 

 not aware that any evidence thereon is yet forthcoming. 

 If the queen is capable of transmuting the Xoseyna 

 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 A osema which 

 causes Pebrine m silkworms. Investigations along these 

 lines are greatly needed. 



LITERATURE BEARIXG UPOX ECOXOIMIC ZOOLOGY. 



(1) Xewstead. R. — The Rood of Some British Birds. Sii^^le- 



rnejit to Jciirnal Bd. of Agriculture . vol. xv. iqoS U^.). 



(2) CoLLlXGE, X\ . E. — The Food of Some British AVild Birds. 



Dulau & Co.. 1Q13 U/-)- 

 13) Leigh, H. S. — Interim Report on The Feeding Habits of the 



Rook. London: 'His Alajesty's Stationery Onice. igif. 

 U) Theob.VLD. F. V. — Insect Pests of Fruit. Published by the 



.Vuthor. "Wye Court. V\"ye, igoQ (A'l is. ?). 



(5) Russell, E. J., and Peieikrbridge, F. R. — Partial Steriliza- 



tion of Soil for Greenhouse V^ork. — Journal Bd. of Agri- 

 culture, vol. xviii. iQi2_. p. 8cQ. 



(6) Theobald. F. — Injurious and Beneficial Slugs and Snails. 



Journal Bd. of A^griculture , vol. xi. IQ05, pp. 594 and 650. 



(7) Theoe.VLD. F. v. — Second Report on Economic Zoology. 



London : British ZMuseum '.Xatural History-), 1Q04. 



(8) CoLLiXGE. \V. E. — The Economic Importance of AVood-Lice. 



Journal Bd. of A^griculture , vol. xxi. 1Q14. p. 206. 

 (q) Carfexter. G. H. — Insects, their Structure and Life. Dent 

 and Co. (4/6). 



(10) ]\Lall_. L. C. — Injurious and Useful Insects. Bell & Sons. 

 (3/6). 



mi) Wllllims. C. B. — The Pea Thrips. A^nnals of Af plied 

 Biology, vol. i, IQ14-15, p. 222. 



(12) Leaflet, Xo. 10. AVire V\"orms). Bd. of Agriculture. 



(Gratis on application.) 



(13) Theobald. F. — First Report on Economic Zoology. 



British Museum (Xatural History). ig:3. 



