JuLy 21, 1899.] 
a new species of Caprellidee, Metaprotella sandal- 
ensis, by Dr. P. Mayer, and notes on a little 
known sea-snake by G. A. Boulenger. 
Part Il. contains a description of the coral- 
like Millepores by 8S. J. Hickson. All the 
specimens are referred to one species, M. alci- 
cornis. Material for the study of the soft parts 
of these delicate organisms was collected. Some 
of this was found to be infected by what seemed 
to be a species of Bacterium, and which Hickson 
has named B. millepore. The nettling capsules 
were studied in detail, and in some the ‘thread’ 
had the form of a delicate tube, in the center of 
which was a filament. This is probably con- 
tractile and brings about the remarkable re- 
traction of the ‘threads,’ as observed by Dr. 
Willey in the living animal. 
Of the crinoids, sea urchins, star fishes and 
brittle stars thirty-nine species are reported by 
F. Jeffrey Bell, almost all of which were well- 
known forms. Of the twenty-four species of 
sea-cucumbers collected, F. P. Bedford re- 
ported two new to science. 
None of the twenty-three species of Sipuncu- 
lids obtained were new, a fact accounted for by 
Shipley from the circumstance that the two 
largest collections of these worms ever made, 
namely, those of Semper and of Sluiter, were 
made in the same general region as that in 
which Dr. Willey worked. While such an out- 
come may be disappointing to those who are 
ambitious for the description of new species, it 
is reassuring in that it shows that a piece of 
zoological work once well done need not be re- 
peated. 
Fourteen species of solitary corals are re- 
corded by J. S. Gardiner, and of these no less 
than eleven are new. Gardiner also contrib- 
utes a paper on the post-embryonic develop- 
ment of one of these, Cycloseris, in which the 
close affinity of this genus with Fungia is em- 
phasized. Of the thirteen species of fleshy 
corals of the family gorgonace reported by I. 
. L. Hiles five are new. 
The earthworms were studied by F. E. Bed- 
dard. Some were too immature for certain 
identification, but among the well-developed 
specimens nine species were recognized, three 
of which were new. 
The second part is fully equal to the first and 
SCIENCE. 
81 
is especially noteworthy for the success with 
which photography has been used in its illus- 
trations. The photogravure plate accompany- 
ing Gardiner’s paper on Cycloseris is remarkable 
for the sharpness of its detail ; the naturalness 
of the figures exceeds that found in the best 
hand lithography. The photographic prints 
which illustrate Hickson’s paper on the Mille- 
pores give an idea of the nature of the material 
collected, whichin the case of these extremely 
variable animals could be obtained by no other 
method. The authors and publishers alike are 
to be congratulated on their successful use of 
photography. 4 
So far as the present work is concerned, such 
criticism as may be offered touches rather the 
whole undertaking than any particular part 
thus far completed. While it may be gratifying 
to an explorer to see the results of his collecting 
and personal investigation in the form of a com- 
pact whole, it is not always certain that this is 
the best way in which to make it accessible. 
Such publications are dependent largely on sub- 
scription for their circulation and necessarily 
fall much behind the better class of scientific 
journals. Since, as in the present case, they 
‘contain the first descriptions of many new 
species, their relative inaccessibility is often a 
serious obstacle to succeeding investigators. It 
is to be regretted that all the present series of 
contributions ‘could not have found places in 
some of the current zoological journals, as, in 
fact, some have, thus, ina measure, assuring the 
accessibility of their contents. 
(Gq lel, 1B, 
Traité élémentaire de mécanique chimique, fondée 
sur la thermodynamique. By P. DUHEM. 
Vols eLiinS18x2o Nem); pp ale Viol. Ver 
18x25 em.; pp. 381. Paris, A. Hermann. 
1898 and 1899. 
Vol. III. treats of homogeneous mixtures and 
solutions with only one volatile component. 
The opening chapter deals with the thermody- 
namic potential of a homogeneous mixture. 
This is followed by one on the state of dissolved 
substances and by another on dilute solutions. 
Next in order comes osmotic pressure, and then 
we find chapters on the hypotheses of Van’t 
Hoff and of Arrhenius, and on the mass law. 
