336 
4. Several starch-grains may develop in one and the same 
chromatophore, 
3. Solution of the starch-grain within the cell is due to the 
ferment diastase. 
6. Stratification of starch-grains is still not well understood, 
it is perhaps due to a periodicity of growth (deposition of new 
layers), and to the action of diastase. 
Part IV. comprises monographs on the biology of the starch- 
grains of Adoxa moschatellina, Hordeum distichum, Dieffenbachia 
Seguine, Pellionia Daveauana, Hyacinthus orientalis, Oxalis Origiest 
and Cyrtodeira cupreata. 
The treatise, which comprises 318 large octavo pages, is written 
in clear scientific style. Some of the cuts are poor. Taken asa 
whole, it is certainly the standard work on starch. It shows a 
great advance made since Nageli’s memorable communications on 
the same subject. ALBERT SCHNEIDER. 
Catalogue of Ohio Plants. WW. A. Kellerman and William C. 
Werner (Geology of Ohio, 7: Part 2, 56-406. 1895). 
Since: the publication of Dr. Beardslee’s “Catalogue of the 
Plants of Ohio” in 1874, a great amount of botanical exploration 
and critical study of the flora of the State has been accomplished, 
no less than 110 published papers and references to the plants of 
the area, during that period, being cited in the work here noticed. 
It was therefore highly desirable that these records should be 
' brought together and incorporated with the unpublished results of 
the recent work of Professor Kellerman, his students and associates 
in the region. The duty has been discharged in a thorough and 
painstaking manner, as evidenced by the fine volume which lies 
before us, and we tender its authors the cordial congratulations of 
American botanists upon its completion. 
The chapter on bibliography cites the titles of 132 papers and 
references, all but, two or three of which have been examined. 
The arrangement of the families is that of Engler and Prantl, but 
in a reverse sequence, beginning with the Compositae and ending 
with the Myxomycetes. The nomenclature is based on the prin- 
_ciples adopted by the Botanical Club of the American Association 
for the Advancement of Science. N. L. B. 
