28 
ZOOLOGICAL LITERATURE. 
ing ornithologists would have been incalculably greater, and at 
the same time facility would have been afforded to the author 
of correcting many of the errors it contains, errors which, ac- 
cording to the method he has adopted, can as a rule only be 
detected by an amount of labour nearly equal to that bestowed 
on the compilation itself. For the same reason it is impossible 
for us to say bow many species here receive names for the first 
time. We believe the number to be large; and therefore the 
matter is to be the more regretted, especially as no descriptions 
are appended — a want of consideration to other ornithologists 
which they will hardly fail to condemn. Yet while our duty 
obliges us to mention these shortcomings, and to point out 
what, as it seems to us, would have made the work worthy of 
the highest praise, we have yet the satisfaction of maintaining 
that according to the method pursued, and so far as its plan 
admits, it is a really honest performance, and one which in that 
aspect does great credit to its author, who, we trust, will in 
time bring out another and an improved edition Avith the infor- 
mation added, which, as we have above indicated, is now so 
much needed. The arrangement followed is, as might be ex- 
pected, mainly that of the author^s previous works ; but the 
want of an index, to at least the genera, is most urgent, and 
will, we hope, be supplied in the concluding part, Avhich may 
be shortly expected. [Cf. Ibis, 1869, p. 464 ; 1870, pp. 116- 
118.] 
Hutton, F. W. On the Mechanical Principles involved in the 
Sailing Flight of the Albatros. Philos. Mag. Aug. 1869, 
pp. 130-136. 
This is in some sort a continuation of the treatise before 
noticed (Zool. llec. ii. p. 56) ; but the subject is handled solely 
from a mathematical point of view. Hence we are prohibited 
from giving an abstract of the authoFs reasoning ; but we deem 
ourselves bound to mention it here among the other papers 
which have reference to* the faculty and the laAVS of flight. [Cf. 
Ibis, 1870, p. 122; Zool. Rec. iv. pp. 45, 46, 50; et infra, 
Krarup-Hansen, C. J. L., et Marey, — .] 
Krarup-Hansen, C. J. L. Essay to a theory of the Flight of 
Birds and Insects, popular treatise, illustrated by woodcuts. 
Copenhagen : 1869. 8vo, pp. 42. 
This appears to be the translation of an original which we 
have not seen. The subject is treated mechanically ; and thereby 
we may be excused from giving any abstract of the author's 
theory. [Cf. Ibis, 1870.] 
Marey, — . Memoire sur le vol des insectes et des oiseaux. 
Ann. Sc. Nat. 5e ser. xii. pp. 49-150, figs. 42. Revised 
issue. Originally published in ‘ Revue des Cours Scienti- 
