Special Cytology.

The "Special Cytology" has, after four years, appeared in a second and augmented edition; this new edition has been extended to include three volumes, whereas the first was confined to two; there are numerous additional illustrations, five hundred more pages (now totaling over eighteen hundred) and nine new sections. Twentyseven of the entire forty-four chapters have received little or no modification; seven have been considerably altered. To produce this work, the assistance of fortysix contributors was sought—in itself an editorial task of imposing proportions; by it the English reader is brought handily to sources the separate collection of which would be an overwhelming labor.

Each section conveniently carries its own table of contents and ends with a list of references, frequently imposing in length and abundant in selected items; there is a total of almost two thousand in the first volume alone.

Many of the works cited were written within