200 Development of Monas Lens. [ joS, ApruTi»7o!' 



ditions of the vital economy, known as " low vitality," seem requisite 

 to permit of the (:?e.structive change in the dead cell by the con- 

 structive change in the dyalizer. Evidence is everywhere ahimdant 

 that such changes can and do take place. Observation shows us 

 that plants in perfect health do not develop their parasites ; that 

 vigorous leaves are not the nidus for the growth of lichens ; that 

 even between living and dead bark of trees the character of the 

 protozoal growth differs, therefore we may conclude that the parallel 

 condition of health in animals is associated with the power to resist 

 destructive change of which Monas and its congeners are the 

 dyalizers. In this sense, then, it is interesting to observe the rela- 

 tion of ozone to disease, and if we consider the chemical changes 

 in atmosphere, and the true nature of ozone, we shall at once 

 become aware of an apparent ratio operandi. 



In reply to a letter which I wrote to him in September, 1866, 

 the late Mr. Samuel Marshall, of Kendal (for many years a close 

 observer of ozone), writes as follows : — 



" In reply to thy query, ' Have you any evidence as to its (ozone) 

 relation to health and disease ? ' This was the chief motive for these 

 observations. By consulting three or four of our medical men, we 

 have all long seen a manifest connection. My observations corro- 

 borate the following conclusion of Dr. Moffatt, who in a letter to 

 me says, ' Maximum of disease occurs with the maximum of ozone, 

 and vice versa. The maximum of deaths takes place with the 

 minimum of ozone.' It will probably interest thee to find that, in 

 the last four months of 1865, we had a fever of a low typhoid cast, 

 and this continued on the first month of 186'6. In the second (month) 

 it began to decline. In the last four months of 1865 the mean 

 quantity of ozone was very low; but it has gradually increased, 

 and the town become very healthy." 



Schonbein says, " Air containing « oW of ozone can disinfect 

 540 times its volume of air produced from highly putrid meat." 



What is this disinfecting ? Is it not most probably the absorp- 

 tion of odorous gases by the Monads of the air which dyalize the 

 ozone and the odorous gas ? * 



It will be evident to all who have observed the action of ozone 

 on dead animal tissues, that it is very easily destroyed. I have 

 made use of bladders to transfer it from one vessel to another, but 

 always found that the contact with the animal membrane at once 

 removed all traces of the ozone. 



Professor Tyndall has referred to the large particles of dust 

 which scintillate in a sunbeam as a cause of disease. These, as 

 shown by Pasteur, Pouchet, and others, as well as by my own ob- 



* See " Experiments on Yeast," ' Monthly Microscopical Journal,' Aug., 1868, 

 p. 100. 



