Proceedhujs. 69 



neatl], sliowiug where the eye should be. The corneal facets 

 are often convex, either externally or iuternally> but in some 

 species the external and internal surfaces are parallel; and it 

 has been a mystery how an optical image could be formed in 

 such eyes. This has been cleared up lately by the construc- 

 tion of some cylinders of glass, &c., which were shown at the 

 meeting of the Eoyal Microscopical Society last month. 

 These were made varying in density from the exterior 

 towards the centre, and formed perfect optical images with- 

 out having the form of a lens. 



On the shells of the Pea Crabs may be found Lepralia, 

 BeU-animalculaB, &c., which feed on still smaller animalculaB, 

 so that there is life within life without end ; in fact, there is 

 no limit to the wonderful works of God ; and it is because we 

 find such pleasure in studying these that we invite the young 

 on these annual occasions, hoping that some of them may be 

 induced to study some of the many wonders of Nature, which 

 will be a continual source of pleasure to them throughout 

 their lives. 



Mr. J. B. Crosfield gave a short address on the subject of 

 ' Sea BiKDs AND THEiE HoMES.' Ho gavc some description of 

 the breeding-station on the Island of Handa, oflf the coast of 

 Sutherland, referring in some detail to several of the species 

 that frequent that and other stations, including the Guillemot, 

 EazorbiU, Puffin, Cormorant, Shag, and several Gulls, &c. 

 He also gave some account of the Bass Rock and its immense 

 colony of Gannets ; and of the Fame Islands, and some of 

 the species of special interest that are met with there, among 

 which are included the Eider Duck, Sandwich Tern, and 

 perhaps still the Eoseate Tern. He mentioned having seen 

 a single King Drake in company with Eiders, on the occasion 

 of a visit to the islands in 1882. He exhibited a series of 

 photographs illustrating the Ornithology of the Bass Eock 

 and Fame Islands, and also specimens of the eggs of many 

 species of sea-birds. 



