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Tribune Extras Lecture and Letter Scries. 



fill mtrrnal parasite Tvliich attacks man is the trichina 

 gpiralis ; it appears in the hop: in the en- 

 cysted comlirioii, is eaten in pork, aud se- 

 cretes itself in the alimentary canal of man. 

 The little worms being set tree, attach themselves to the 

 walls and develop with frightful rapidity in five or six 

 clays. Eifh family produces froifl 600 to 1,000 worms. 

 As one ounce of pork sometimes contains a quavtcr of a 

 million worms, it is no wonder that a meal of raw pork 

 should prove a very serious indulgence. As soon as the 

 young worms are born they eat their wav all over the 

 body, get into the blood-vessels, and ate carried every- 

 where. Death generally ensues in from 15 to 60 days. 



Several cutaneous diseases are known to be caused by 

 the growth of fungi ; the riiur-worm and similar affec- 

 tions, for example. The development of internal veee- 

 tui'lr parasites in both plants aud animals was the next 

 subject of discussion. The potato-rot, the muscardine 

 of the silk-worm and house-fly, and the pebrine of the 

 Bilk-worm were described as examples. The latter dis- 

 ease, saM the Professor, cost France by the damage iu- 

 llicti d upou tlie silk crop more than $200.000,000. 



The development of bacteria iu the blood of animals, 

 and tlie production thcivby of most fatal and malignant 

 diseases, has been the subject of interesting experiments. 

 Instances of .the effect of inoculating infected blood 

 were cited, ;snd the fact was stated that the bacteria are 



j invariably found in the blood of pen-ons suffering from 

 typhoid fever, small-pox, scarlet fever, puerperal fever, 

 aud other diseases. The investigations upou vaccine 

 virus bring this contagion into the same category with 

 the other tunyoid discast-s. It was thus shown that but 

 little is needed to establish fully the gorin theory; that 

 many of the most fatal diseases known to man. such as 

 cholera , typlmi, I, typhus, yellow fever, etc., were gen- 

 era!' d in this way. The analogy in tlie mode of devel- 

 opment, the introduction and the course of the syni|H 

 toms, aud the production of the contagion, was clearly 

 pointed out. 



Dr. Beale's theory supposes that these diseases are not 

 developed by special germs, but that the white corpus- 

 cles of the blood, which In their normal or regular devel- 

 opment are produced in the ordinary course of life, may 

 develop, under special circumstances, aouormally into 

 bodies germs we may call them of diseases which not 

 only produce this disease in the person in whom they are 

 developed, but which may pass out as do the spores of the 

 fungi, and, entcr'ug the bodies of other persons, produce 

 a similar disease. 



The lecturer closed with a discussion of the means of 

 prevention, which depend upon the prevention of the 

 development of the diseased germs, the greatest protec- 

 tion being afforded by cleanliness. 



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