648 SCIENCE PROGRESS 



to be a colloidal system in which special processes and functions have become 

 localised and fixed in certain regions " ; this has led to the evolution of cell 

 organs such as the nucleus and Golgi apparatus, which are more or less 

 permanent structures. Exactly what part in such colloidal systems the Golgi 

 apparatus plays, it is impossible to say, owing to the incompleteness of our 

 knowledge of the physico-chemical activities of the cell. 



BIBLIOGRAPHY 



1. Cajal, R, S., Various papers in recent Numbers of Trab. Lab. Invest. Biol., 



Madrid. 



2. Da Fang, C, Changes of Golgi's Apparatus in Nerve Cells of the Spinal 



Cord following Exposure to Cold, Jour, of Nerv. and Ment. Dis., 1921. 



3. Da Fang, C, On Golgi's Apparatus of Transplantable Tumour Cells, 



7th Sclent. Rep. of Invest, of Imp. Cancer Res. Fund, 1921. 



4. Gatenby, J. Bronte, Re-edition of BoUes Lee's Microtomist's Vade- 



mecum, and various papers in recent numbers of Q.J. M.S. and Jour, 

 of R.M.S. 



5. Gatenby, J. Bronte, Cytoplasmic Inclusions of the Germ Cells, Part V, 



Q.J.M.S., 1920. 



6. Gatenby, J. Bronte, The Identification of Intracellular Structures, 



Jour. R.M.S. , 1919. 



7. Gatenby, J. Bronte, and Woodger, J, H., The Cytoplasmic Inclusions 



of the Germ Cells, Part IX, Q.J.M.S., 1921. 



8. Gatenby, J. Bronte, and Ludford, R.J., Dictyokinesis in Germ Cells, 



Proc. R.S., 1921. 



9. Ludfgrd, R. J., Contributions to the Study of the Oogensis of Patella, 



Jour. R.M.S., 192 1. 



10. Murray, J. A., Contributions to a Knowledge of the Nebenkern in the 

 Spermatogenesis of Pulmonate Molluscs, Zool. Jahrb., Bd. xi. 



11. Penfield, W, G., Alterations of the Golgi Apparatus in Nerve Cells, 

 Brain, 1920. 



12. Penfield, W. G., The Golgi Apparatus, Anat. Rec, 1921. 



Text Figures. — The greater number of the figures have been drawn 

 diagrammatic, involving alteration from the originals. In these cases the 

 journals in which the original figures appear is given in brackets together 

 with the names of the authors. 



Explanation of Lettering. — CH = Chromosomes ; GA = Golgi Appara- 

 tus ; GE = Element of Golgi Apparatus ; N = Nucleus ; S = Division 

 Spindle ; T ==■ CanalicuU of Holmgren. 



THE PLACE OF INSTINCTS IN OUB SOCIAL LIFE 



(J. S. Dunbar). 



It is a truism to remark that, when we compare the life of animals with 

 the life of human beings, we find certain broad similarities alike on the 

 physiological and the psychological sides. The dominant facts of nutrition 

 and reproduction are obviously analogous, and in the same category are 

 the more patent similarities in anatomy. But in the general field of 

 behaviour, the comparison is not so easily traced ; man does not seem to be 

 in the same line of development. It was this distinction that led Descartes 

 to formulate a purely mechanical scheme to explain the behaviour of all 

 the animals except man. It is evident that such a scheme sprung from the 

 observation that the behaviour of animals could be more or less easily 

 accounted for in terms of well-defined laws. Nowadays, however, we no 

 longer cling to the mechanical explanation, but rather define the difference 

 between man and the other animals as one depending on the proportion of 



