SECTIONAL TRANSACTIONS.—I. 463 
imprint of the animal species from which it arose. We have seen that this is not so, 
and to account for this one would have to assume that a filterable virus was something 
in the nature of a haptene, which, uniting with the cell degeneration products, gives 
them a new antigenic value—a virus specificity. This would imply an agent of simple 
chemical structure—non-protein and yet capable of multiplication. The only 
reasonable explanation of these facts is that filterable viruses are independent living 
things. 
Dr. W. F. Bewiey.—Plant Viruses. 
Dr. G. H. Eacies.—Artificial Cultivation. 
Dr. W. J. E.rorp.—Filters and Filtration. 
Filtration experiments with several typical viruses and proteins employing a 
refined method of technique with a new series of graded collodion membranes have 
yielded very consistent and well-defined results. These have enabled the relative 
sizes of the infective agents to be determined under comparable conditions as well as 
estimated values for their sizes to be given. The following size relationships have 
been deduced :— 
B. Prodigiosus . - : : : - 0-5-1-0u 
Bovine Pleuro-Pneumonia . ; 4 . 0-1-0°5 
Vaccinia Virus (testicular strain) . : ~ 0:125-0-175p. 
Infectious Ectromelia . : : ; - O-1-0-15y 
Bacteriophage (Coli) . : : : . 20-30uu. 
Foot and Mouth disease virus : ; . 8-12uu 
Oxyhemoglobin . = 7 : : . 3-Sup 
Filtration evidence, therefore, indicates that the viruses cannot as a class be 
differentiated sharply from ordinary bacteria by any marked gulf existing between 
their relative sizes. On the contrary the viruses have sizes ranging from those of the 
smallest recognised bacteria down to within two or three times the size of serum 
proteins and oxyhemoglobin. 
Dr. W. KE. Gyu.—Relation of Viruses to Malignant Tumours. 
Prof, J. C. G. LepinGHam. 
Tuesday, September 29. 
Jiscussion on Problems of Resuscitation, including Asphyxia, Electrocution, 
Drowning, &c. (Sir Epwarp Swarpey-Scuarer, F.R.S; Prof. 
YANDELL HenpErson; Dr. C. K. Drinker; Sir Francis Saipway ; 
Sir Bernarp Spruspury ; Prof. J. A. Gunn; Prof. J. 8. Hatpane, 
F.R.S.) 
H. Suarpey-Scuarer, F.R.S. 
- Resuscitation in asphyxia. Circumstances producing asphyxia and requiring 
suscitation :— 
1. Mechanical causes. Obstruction of air passages, as by drowning, strangula- 
tion, hanging, foreign bodies. ~ 
_ 2. Inhalation of air deprived of oxygen, such as carbon monoxide. 
3. Paralysis of respiratory centre by electric shock. 
4. Paralysis of respiratory centre by drugs, such as morphine, cocaine or volatile 
F anesthetics. 
Physiology of respiration. Its dependence on (i) chemical stimulation of 
piratory centre by COs, (ii) reflex stimulation of afferent nerves. 
