VIRCHOW, ON TRICHINA SPIRALIS. 47 



communicated to the Academy, Professor Zencker has dis- 

 covered the source of the Trichince which had infected his 

 patient, and thus been able to throw great light upon the 

 etiology of this affection. As the patient had been brought 

 to the hospital at Dresden from the country, Professor 

 Zencker instituted inquiries, and found that, four weeks 

 previously, a pig containing Trichince had been killed in the 

 same dwelling ; that the ham and sausages made of the flesh 

 of this animal contained a great number ; and lastly, that 

 the butcher who had slaughtered the pig, and had swallowed 

 the Trichina in the recent state, as several other persons 

 also did, had, as well as they, presented rheumatic and 

 typhoid symptoms of greater or less severity; but the 

 patient who was sent to Dresden was the only one who fell a 

 victim to the ingestion of the flesh of this pig. 



This condition therefore now involves questions of great 

 hygienic interest. 



1. The ingestion of pig^s flesh, fresh or badly dressed, con- 

 taining Tinchince, is attended with the greatest danger, and 

 may prove the proximate cause of death. 



2. The Ti'ichince maintain their living properties in de- 

 composed flesh ; they resist immersion in water for weeks 

 together ; and when encysted, may, without injury to their 

 vitality, be plunged in a sufficiently dilute solution of 

 chromic acid for at least ten days. 



3. On the contrary, they perish and are deprived of all 

 noxious influence in ham which has been well smoked, and 

 been kept a sufficient length of time before it is consumed. 



New Experiments on Heterogenesis, by means of the 

 Air contained in the Closed Cavities of Plants. By MM. 

 N. JoLY and Ch. Mussey. 



C Comptes B-eudus,' Oct. 22, 1S60, p. 627.) 



{Abstract.) 



At the beginning of the year, the authors communicated to 

 the Academy the result of some experiments instituted with 

 the view of satisfying themselves with respect to the origin of 

 the Microphytes and Microzoa, which are always and every- 

 where produced in infusions of organic matters. After new 



