120 NEW BOOKS, WITH SHORT NOTICES. [^i^uJ^^i, plrrisS^^ 
sideration of tlie Protozoa, and quite exclusive of a multitude of 
papers on species and on the several classes of this sub-kingdom 
considered specially. We have not space to refer to all these gene- 
ral " separate publications," but we may mention a few of them. 
We find notices of numerous papers on Hyalonema. Apart, for 
instance, from the articles by our fellow-countrymen, we are fur- 
nished with references to memoirs by Signor Bocage, Ehrenberg, 
Max Schultze, and one on Euplectella by Herr Semper. Then 
there are recorded papers by Greef on Aciinophrys, by Claparede 
on Lyclmopliora, by Cienowski on the structure of Lahyrintliulce, 
by Lieberkiihn on the contractile structure of sponges, by Luders 
on the development of Bacteria and Vibriones, by Poulet on Infu- 
soria in the air expelled from the lungs in hooping-cough, by 
Eeichert on the contractile substance of Polythalamidae, by Kouget 
on the muscular contractions of Vorticella, by Schneider on the 
structure of the Eadiolariee, and various other important contribu- 
tions. We have said enough to show the great usefulness of the 
' Zoological Eecord,' suffice it to state in conclusion that the work 
is now sold in three parts, any one of which may be had separately. 
One includes the vertebrates, the other insects, &c., and the third 
all the other invertebrates. Dr. Giinther's confreres are Mr. Alfred 
Newton, Mr. W. S. Dallas, Dr. Edouard Von Martens, and Dr. E. 
Perceval Wright ; and it is but scant justice to each and all to say 
that they have done their work thoroughly and satisfactorily. 
On Molecular and Microscopic Science, by Mary Somerville, in two 
vols. London: John Murray, 1869. — With the "Molecular" or 
rather the " Physics " portion of the present work we have no 
immediate concern, but we may say a word or two about the other 
portion of Mrs. Somerville's handsome volumes. Imprimis — ■ 
and it is a point which will surprise many of her readers — the 
author makes no more than an incidental allusion to the micro- 
scope. No form of instrument is described, and no instructions 
are given as to the collection, preparation, or mounting of micro- 
scopic objects. The work is essentially one on general Histology, 
animal and vegetable, with a sketch of some of the more inter- 
esting groups among the invertebrate animals, and is in great 
measure — if we are not much mistaken — based on Dr. Carpenter's 
admirable ' Microscope and its Eevelations.' There is, of course, 
nothing that is new in a treatise which is admittedly a compilation, 
nor can we complain of this ; but we have a right to expect that 
the compiler of a work like that before us has taken pains to 
collect accurate information, and to collate the matter collected 
from different sources so as to give uniformity of design, at least 
in semblance, to the whole. It strikes us that this idea, if it at 
all occurred to the author, has not been very rigidly adhered to. 
Further, we note that some of the most instructive animal groups 
— at least, in so far as " Microscopic Science " is concerned — have 
been very much neglected by Mrs. Somerville. This is, to a cer- 
tain extent, evidenced in the section devoted to the Infusoria, and 
especially forcibly so in the six meagre pages in which the 
