640 PAEASITIC DISEASE. 



the grass-plot of tne menagerie afforded, recovered the others in a very 

 short time. 



" Fourthly, The plan I have here adopted, by way of experiment, of 

 opening the trachea and removing the worms at once. This method is 

 evidently only necessary when the disease has advanced so far that im- 

 mediate suffocation becomes inevitable; or it may be resorted to when 

 other methods have failed. In the most far-gone cases, instant relief 

 will follow this operation, since the trachea may with certainty be 

 cleared of all obstructions. 



" Lastly, The most essential thing to be observed, in view of putting 

 a check upon the future prevalence of the disease, is the total destruction 

 of the parasites after their removal a precaution, however, which can- 

 not be adopted if Mr Montagu's mode of treatment is followed. If the 

 worms be merely killed and thrown away (say, upon the ground), it is 

 scarcely likely that the mature eggs will have sustained any injury. 

 Decomposition having set in, the young embryos will sooner or later 

 escape from their shells, migrate in the soil or elsewhere, and ultimately 

 find their way into the air-passages of certain birds in the same manner 

 as their parents did before them." 



So far as calves and sheep are concerned, we find that they 

 should be supported with tonics, and be made to inhale the 

 fumes of iodine, chlorine, or tobacco. Mr Stephen, of Cart- 

 ruther, mentioned, at a meeting at Liskeard, in Cornwall, 

 held on the 14th of September, 1860, that the plan he 

 adopted was as follows : " The lambs were put into a house 

 as air-tight as possible, in lots of about forty. The ingre- 

 dients viz., tar, sulphur, and spirits of turpentine were 

 put into a pot of burning coals, whereby a gas was evolved 

 which completely filled the house. The pot was suspended 

 by a chain from the ceiling, and was brought as near to the 

 heads of the lambs as convenient. An addition of the in- 

 gredients was made when necessary, to maintain a regular 

 supply of gas. They were kept in this situation about 

 twenty-five minutes each time. This treatment was repeated 

 thrice, and no further loss sustained." 



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