DISEASES PBODUCED BY CYSTICA. 81 



of dogs, into the Tcenia serrata, I venture to assume that the 

 young of this tape-worm, after its immigration into ruminants, 

 becomes developed in their nervous centres into the Coenurus 

 cerebraliSj which, according to the situation it occupies, produces 

 either vertigo by pressure upon the brain, or the phenomena 

 characteristic of pressure upon the spinal marrow. 



The only prophylactic measure against the morbid conditions 

 induced by the Coenurus cerebralis must therefore be to guard 

 against the immigration of the young of the Tcenia serrata. 



It will possibly be objected that, even if the generation of 

 the Tcenia serrata out of the scolices of the Ccenurus cerebralis 

 had been proved, the production of the Coenurus cerebralis from 

 the young of the Tcenia serrata must first be demonstrated, 

 in order that, from the facts before us, we may have the right 

 to consider immigrated young Teenies as the cause of the 

 staggers proceeding from Coenurus cerebralis. The law r s of pro- 

 pagation of these animals long since suggested the view I have 

 just put forth, but recently I have been put in possession of facts 

 which directly support it. Dr. Haubner, professor at the vete- 

 rinary school in Dresden, has in fact had the goodness to com- 

 municate to me that in that establishment, on the 7th of January 

 of this year, several lambs were fed with perfect joints of the 

 tape-worm of dogs, containing ova, and that on the 20th of 

 January the first appearances of the staggers manifested them- 

 selves at the same time in all, whilst the remaining animals of 

 the flock to which those lambs belonged continued healthy. The 

 diseased lambs were killed and examined in succession at intervals 

 of eight days, by which proceeding Professor Haubner obtained 

 the following results : * 



"At the commencement of the disease various symptoms 

 of irritation and inflammation of the brain appeared, which 

 perfectly accorded with those which Dr. Haubner had already 

 become fully acquainted with in cases of the so-called spontaneous 

 development of this disease. In this stage the sheep might 

 either die, or else the irritation of the brain might pass away, 

 and the Coenurus-cysts proceed to further development. Upon 

 dissection after three or four days, reckoning from the first 

 appearance of the disease, Dr. Haubner found many cysts in the 



1 A short communication upon this subject has just been made by Professor Haubner 

 to ' Hamms Agronomische Zeitung,' 1856, No. 10, p. 157. 



6 



