ABSTRACT OF PROCEEDINGS. xlvii. 



2. "The Classification and Systematic Nomenclature of 

 Igneous Rocks," by H. Stanley Jevons, m.a., b.sc, p.g.s.: 

 Lecturer in Mineralogy and Petrology in the University 

 of Sydney. 



Remarks were made by Mr. W. J. Olunies Ross, Prof. 

 David, Mr. O. A. Siissmilch, and Dr. Oooksey. Mr. Jevons 

 replied. 



The following is an abstract of the Fifth Popular Science 

 Lecture 1904 on " The Nervous System in its Genesis and 

 Development," by Dr. J. Froude Flashman, m.d., Honorary 

 Lecturer in Psychological Medicine and Neurology, Uni- 

 versity of Sydney, Director of the Pathological Laboratory 

 of the Lunacy Department, delivered at the Royal Society's 

 House, on Thursday, November 24th, at 8 p.m. The lecturer 

 introduced his subject by indicating the enormous difference 

 between the highest and lowest forms of nervous system. 

 In dealing with the genesis of the system he pointed out 

 that almost the whole body of an amoeba possessed the 

 general properties of undifferentiated protoplasm, viz., 

 irritability, conductivity, and contractility, but that when 

 we come to animals a little higher in the scale, we find 

 a subdivision of labour — one part being detailed to receive 

 impressions (the sense organs) another to conduct (the 

 nerves), and another to contract (the muscles). It was 

 further shown how other parts of the general protoplasm 

 become differentiated into harder protecting structures to 

 guard the more delicate sense organs, nerves, etc. The 

 lecturer then traced the development of such a system, 

 showing during the evening lantern slides of the nervous 

 systems of ascidians, actinians, planarians, annelids, cray- 

 fish, scorpions, spiders, insects, oysters, snails, octopus, 

 shark, frog, snake, turtle, birds, marsupials, squirrel, cat, 

 dog, horse, dolphin, chimpanzee, gorilla, orang-utan, human 

 idiot, and man. Reference was also made during the even- 



