SCIENTIFIC NEWS 319 



contains an extremely limpid water, and a white fubftance, Caufedby ahy- 



divided as if into grains, which have been found by the mi- j^^^j^ 



crofcope, to be real worms. It appears, that to cure this 



diforder, the head of the fheep mufl necelTarily be opened, 



and the hydatid extricated : but this operation has hitherto \^^ extraaion 



. ■ 1 • 1 r I- 1 dangerous. 



appeared to hazardous, and has been attended with lo little 



fuccefs, even in the veterinary fchool at Alfort, that the Society 

 has deemed it highly important to the fcience of agriculture, 

 to offer a prize to the perfon who (ball point out the bed me- 

 thods of treating the vertigo of flieep, and curing them per- Whatisthebcft 

 fed^ly of this diforder. He will take care that his method be • j^ > 

 fupported by experiments made with accuracy, and confirmed 

 by unqucftionable teftimony. 



The prizes will confift of medals, which the fociety will 

 deliver at the public meeting, on the 28th of April, 1804. > 



Cryftallization of Lime hy Tromfdorff, denied hy Bertholkt. 



JLN the firtl volume of the odavo feries of this Journal, p. Error refpefllng 



302, is inferted " A method of cryftallizing lime, by ProfelTor ^^^ cryftalliza- 



-^ ° "^ . tion of ]ime. 



Tromfdorff," tranflated from the Journal der Pharmacie, Vol. 



IX. part I. p. 108. The fame procefs is alfo in Van Mons's 

 Chemical Journal, No. II. According to which, muriate of 

 lime is to be boiled with one fourth or even lefs of cauftic lime, 

 and the fluid is to be concentrated. Afterwards, by flow eva- 

 poration, long flender cryftals of caujiic lime are obtained, 

 which are to be freed from the adhering muriate by ablution in 

 alcohol. 



This refult is denied by Berthollet, who, in his Ejjai du 

 Statique Chimique, Vol. 1. p. 350, fays, '* I have repeated this 

 experiment, and have afcertained that thefe cryftals were not 

 linie, as has been announced, but muriate of lime with an excefs 

 of lime.'* He continues, " if thefe cryflals be treated with 

 water, other proportions are eflabliftied; the part which dif- 

 folves is the muriate, which retains but a fmail excefs of lime, 

 and the portion which is not diflblved retains a greater excefs 

 of lime; by adding water, fuccefllive feparations may be ob- 

 tained, and the proportions will depend on the relation of the 

 diflblving force to the reliftance of the cohefion." 



ConierfiGH 



