Rambles in Alpine Valleys. 



Being the Wanderings of a Field-Naturalist in Piedmont. 

 (Crown 8vo. Bound in Cloth, with map and photographs of district. Price 3/6). 



This book describes the lovely valleys which open out on the Italian side of Mont 

 Blanc. It deals with the natural objects of interest — entomological, botanical, orni- 

 thological and geological. It contains the most recent scientific discoveries and 

 suggestions relative to the objects described. 



It contains much scientific entomology apart from the actual description of the 

 iusect fauna of the district. The chief insects discussed with relation to their environ- 

 ment are the Anthrocerids, the Parnassiids, the Gnophids, the Coliads, the Erebiids, 

 the Argvnnids, etc. The origin of the coloration of Alpine insects, the sexual 

 dimorphism presented by them, and the explanations thereof are important features in 

 the book. 



Random Recollections of Woodland, Fen 



and Hill. 



(Crown 8vo., Illustrated, Cloth. Price 2/6, a few copies of the 1st edition. 3/-). 



The collecting expeditions of an entomologist into various well-known localities 

 in various parts of the British Islands — Wicken, Cuxton, Chattenden, Freshwater, 

 Deal, Sandwich, Dover, the Medway Marshes, Argyllshire, etc., with full account ot 

 the fauna to be found in these localities. 



Woodside, Burnside, Hillside and Marsh. 



(Crown 8vo., Illustrated, Bound in Cloth. Price 2/6). 



Another series of collecting expeditions into well-known entomological and 

 natural history localities, with description of botanical, geological f ornithological as 

 well as entomological matters of interest to be found therein. The places dealt with 

 include Uobham Woods, Cuxton Downs, the Western Highlands, Cliffe — all well 

 known for their rich entomological fauna. 



Some considerations of Natural Genera and incidental 

 reference to the Nature of Species. 



Price 1/6 net. 



A most important essay, dealing with the possibilities and limitations of natural 

 genera ; the evolution of species, and their natural grouping into genera and higher 

 divisions. This and the following deal thoroughly with the principles of classification 

 on evolutionary lines. 



Some considerations on the Nature and Origin of Species. 



Price 1/6 net. 



Doubtful species — Hybridity of allied species — Variations always present in 

 organic beings — Utility and the origin of specific characters — Average characters as 

 exhibited by species — Individuals of a species not identical — The origin of varieties or 

 local races — On the origin of species — Specialisation of genital organs — Variation in 

 genital organs — Sterility not a necessity of specific distinction — Incipient species and 

 partial sterility — Value of recognition marks — Isolation — Specialisation to foodplant 

 — Isolation by difference of habitat — Difference of hybernating habit tending to 

 isolation — Doubtful isolation — Isolation by diverse habits — Conditions necessary for 

 specific distinctness — Phylogenetic age of species — Origin of so-called specific 

 characters — Spontaneous variations acted upon by natural selection in the modi- 

 fication of species — Specific, generic, tribal, etc., characters utilitarian — Useless 

 specific characters - Fifect of food in production of specific characters — Sexual 

 selection in Lepidoptera — Isolation fixes characters already formed — Laws of growth 

 — Summary of effects produced by climate, food, etc. — Utility of specific characters. 



