3$6 PLEASANT WA YS IN SCIENCE. 



and the disease called by physicians "congestive bronchitis" 

 was set up. 



A very singular circumstance was noticed also as to the 

 effects of ozone on the different orders of animals. The 

 above-mentioned effects, and others which accompanied 

 them, the description of which would be out of place in 

 these pages, were developed more freely in carnivorous than 

 in herbivorous animals. Rats, for example, were much 

 more easily influenced by ozone than rabbits were. 



The results of Dr. Richardson's experiments prepare us 

 to hear that ozone-periods, though characterized by the 

 absence of certain diseases, bring with them their own forms 

 of disease. Apoplexy, epilepsy, and other similar diseases 

 seem peculiarly associated with the ozone-periods, insomuch 

 that eighty per cent, of the deaths occurring from them take 

 place on days when ozone is present in the air in larger 

 quantities than usual. Catarrh, influenza, and affections 01 

 the bronchial tubes, also affect the ozone-periods. 



We see, then, that we have much yet to learn respecting 

 ozone before we can pronounce definitively whether it is more 

 to be welcomed or dreaded. We must wait until the re- 

 searches which are in progress have been carried out to their 

 conclusion, and perhaps even then further modes of inquiry 

 will have to be pursued before we can form a definite 

 opinion. 



