TRANSACTIONS OF SECTION I. 723 



(6) The great developmental wave which sweeps over the psycho-motor centres 

 at this period. 



(7) The indications of degeneration of the anatomical units posited as charac- 

 terising the psycho-motor cortex, as hhtologically defined. 



(8) Illustrations of degeneration from want of rest and sleep resulting in 

 special forms of mental derangement. 



(9) Ten hours' sleep should be claimed as a fit allowance for growing boys and 

 girls subjected to scholastic training. 



(10) Reference was made to Sir Lauder Brunton's views of the motor centres 

 (iu a restricted sense) forming the basis of the social imit. 



3. The Hcemalology of Carbon Monoxide Poisoning. 

 By G. a. Nasmith, M.A., Ph.D., and D. A. L. Geaham, M.B. 



Guinea-pigs living for months in an atmosphere of dilute carbon monoxide, so 

 that the blood becomes partly saturated with this gas, show an increase in the 

 number of erythrocytes and hsemoglobin ; the rise is directly proportional to 

 the extent of the saturation of the blood. When, for instance, 25 per cent, of the 

 haemoglobin is united with carbon monoxide this increase amounts to 16 per cent, 

 of the haemoglobin and 33 per cent, of the number of erythrocytes, and is attained 

 within a month. With 45 per cent, of the haemoglobin saturated the increase of 

 the erythrocytes amounts to 50 per cent. 



The initial effect of the gas is to cause degeneration of the erythrocytes, 

 associated with a marked leucocytosis of the oxyphile granular forms. The 

 extent of the degeneration and the degree of the leucocytosis is again directly 

 proportional to the strength of the gas employed ; this leucocytosis corresponds 

 closely with that of an ordinary toxaemia. 



We conclude that the action of carbon monoxide on the body is due entirely 

 to its ability to deprive the tissues of their normal oxygen -supply, as pointed out 

 by Haldane. The physical and physiological effects are very similar to those 

 produced by high altitudes. The ultimate effects on the body we consider to be 

 due to deranged anabolic and liatabolic activity in the body cells, resulting 

 probably iu the accumulation of excretory substance and the formation of toxic 

 degeneration products. 



4. On the Mechanism of the Locked Jaw of Tetanus, 

 By Professor Sherrington, F.K.S., and Dr. Roap. 



TUESDl Y, A UG UST 7. 



Joint Discussion ivith Section B (Chemistry) on the Factors which 

 determine Minimal Diet Values. Opened by Dr. F. Gowland 

 Hopkins, F.R.S. 



The following Papers were read : — 

 1. The Electrical Resistance of the Tissues. By Dr. Dawson Turner. 



How measured in the case of the blood, urine, ascitic, and other fluids. 

 Observed and specific resistance. Difiiculty of measuring the resistance of the 

 blood, owing to the small quantity obtainable; the apparatus used. 



Table of the specific resistances of some of the tissues. 



Importance of measuring the resistance as an aid to diagnosis and prognosis in 

 disease (alterations in pneumonia, diabetes, pernicious anaemia, &c.), and as a 

 means of measuring the time between the ingestion of salts and their appearance 



3 A2 



