613 
ZOOLOGICAL LITERATURE. 
don, published by Churchill. 8vo (pp. 34, with 11 wood- 
cuts) . 
Although this ably written pamphlet apparently contains 
nothing original or new, it nevertheless offers an excellent 
summary of all that is known respecting the Trichina. As the 
object which the author appears to have in view is chiefly pro- 
fessional, it is perhaps unnecessary to do more, in this place, 
than testify to the general ability with which he has performed 
his task ; nevertheless one cannot permit the notion to go forth 
unchallenged, that Virchow has succeeded in showing, by 
experiments, the existence of alternate generation in Trichina 
(p. 12). Dr. Althaus refers to the original experiments above 
mentioned (in our notice of Virchow^s brochure), and adds, 
These and other experiments of Virchow, which were con- 
firmed by those of Leuckart, Claus, and others, have led to 
the conclusion that there exists alternate generation for Trichina 
as it does for Cysticercus.^^ Dr. Althaus, at various places, 
follows Virchow very closely in the wording of his text ; but 
we have not been able to satisfy ourselves that Virchow has 
been ^Med to the conclusion''^ above mentioned. At page 13 
of his brochure Virchow writes as follows: ^‘^Es verhalten sich 
demnach die Trichinen in einer Beziehung ganz anders, als die 
Band- and Finnenw firmer. Sie brauchen nicht zweiinal, soiidern 
nur einmal genossen zu werden, um eine neue, den Korper 
durchwandernde Brut hervorzubringen.'^ At page 13 also, in 
the English pamphlet. Dr. Althaus writes : It thus appears 
that the danger which may accrue to man from Trichina is far 
greater than that with which he is threatened by Cysticercus and 
Tsenia. While the latter require to be eaten on two several 
occasions, the former only requires to be eaten once, in order to 
produce a progeny which infects the whole system. In our 
opinion, the latter sentence should have been accompanied by 
inverted commas or by the final addition of Virchow^ s name 
wfithin brackets. The same remark is applicable to other easily 
recognizable quotations with which Dr. Althaus^s pamphlet 
abounds; moreover the Essay would not have been less 
valuable if the author had indicated more precisely the German 
sources whence he has obtained his information. Names are 
quoted abundantly ; and why not, therefore, the works, memoirs, 
and communications of the several authorities referred to ? In 
this respect, Virchow^s brochure is quite a model for imitation. 
Lastly, we repeat our protest as to the notion of the existence of 
any alternate generation in Trichina, and almost feel dis- 
posed to request the author to have the kindness to explain to us 
what he means. 
The publishers part in the production of this brochure is 
sufficiently praiseworthy. In the Preface it is stated that the 
