2 02 [Proc. B.N.F.C., 



(b.) Intrusive Type. Dolerite rich in olivine; Slieve Mish. 

 Typical sections of these rocks were exhibited under the micro- 

 scope and numerons hand-specimens were also on the table. 



In conclusion, the lecturer referred briefly to two features of 

 the County Antrim basaltic rocks, one of which, he believed, was 

 quite unique in petrology. First there was the fairly common 

 occurrence of "tube-amygdaloid" at the basal portion of many of 

 the lava-flows. This had already been recorded from the West of 

 Scotland, from South Africa, and from India. The other feature 

 had already been described in detail by Mr. Strachan in his paper 

 on The Origin of Zeolites, read before the Geological Section 

 of the Club two years ago, and consisted in the complete inclusion 

 of primary minerals, such as aiigite and felspar, in the zeolites, 

 thus proving conclusively the contemporaneous formation of the 

 latter with the basalt itself. This occurred chiefly in cavities 

 containing natrolite (and lime-natrolite) in common olivine-basalt, 

 and was an abnormal structure quite distinct in certain character- 

 istics from the structures found in " analcime-lavas." 



"the toxic effects of fresh water on marine animals, 

 and of sea water on fresh-water species." 



A meeting of the Zoological Section was held in the 

 Museum on 8th December, the President, Mr. Nevin H. Foster, 

 M.B.O.U., in the chair, when a paper on above subject was read 

 by Mr. W. J. Dakin, M.Sc. Mr. Dakin gave a lucid description 

 of the effects of osmotic pressure, and afterwards detailed the 

 result of some of his experiments carried out in the North and 

 Baltic Seas. The^e results have already been published in the 

 Bio-Chemical Journal for 1908. The paper gave rise to an 

 animated informal discussion, in which the Chairman, Messrs. 

 R. Welch, M.R.I.A., A. W. Sielfox, A.R.I.B.A., H. L. Orr, 

 J. N. Milne, and Joseph Maxwell, J. P., took part. 



