1893.] Recent Literature. 245 
and of all other cells, from which the reader, can almost reconstruct the 
. eggs for himself. 
Only a few points more can þe noted in the later history. The 
mouth invagination occurs on a line between the bases ofthe antennular 
buds; the history of the eye is followed, the author agreeing well in 
most points with Parker, but affording little support to Watase’s theo- 
retical views. The antennal gland (green gland) is regarded as meso- 
dermal, but its opening was not found even in the larval stages; the 
alimentary canal proper is almost wholly made up from stomodeal and 
proctodeal invaginations, the true entoderm, which arises by the migra- 
tion of yolk cells to the posterior end of the yolk being chiefly con- 
fined to the hepato-pancreatic diverticula and their ducts. 
The greatest fault which one can find with the paper is that which 
is due to its composite nature, the result being an apparent lack of 
arrangement, so that it is difficult to follow in detail certain structures. 
This possibly was unavoidable where two authors were each contribut- 
ing their parts and also where the composition of the text was done at 
different times. The volume is filled with valuable facts and cannot 
be ignored by the student of Crustacean ontogeny. It is by far the most 
valuable zoological memoir yet published by the National Academy. 
Campbell’s Biology.*—It is rarely that such a veritable hodge 
podge as this comes to our table. It is an example of absorption with- 
out assimilation on the part of the author. The plan of the work is 
fairly good but it is a misfortune for any student to have it as a guide 
in his studies. It is worse than the notorious works by the late Dr. 
Steele, for their faults were largely negative; they taught absolutely 
nothing good or bad, but this is “filled with lots of things that are not 
so.” The work intends to be a companion to the laboratory work, and 
gives much space to protoplasm, the cell and the like, and then takes 
up without any apparent order the structures and classification of 
animals and plants. A few passages out of over a hundred which we 
have marked will illustrate the chief shortcomings of the work. 
P. 137. The lungs “ develop as an outgrowth of the alimentary canal. 
This outgrowth becomes completely separated off from the oesophagus, 
and at its lower end divides into two or more tubes, which communi- 
cate with the pharynx by a single tube, the trachea.”—Pp. 145-6. The 
statement is made without a single qualification that the ureter of ver- 
3Text book of Elementary Biology, by H. J. Campbell, M. D., Lond. 
London, Swan Sonnenschein, New York, Macmillan & Co., 1893. 12 O., pp. 
xii -+ 254. 
