 Then, in 1766, Pierre Simon Pallas predicted that these hydatid cysts found in infected humans were actually larval stages of tapeworms.A few decades afterwards, in 1782, Goeze accurately described the cysts and the tapeworm heads, while in 1786 "E. granulosus" was accurately described by Batsch.Half a century later, during the 1850s, Karl von Siebold showed through a series of experiments that "Echinococcus" cysts do cause adult tapeworms in dogs.