282 BOTANICAL GAZETTE [octosEr 
announced purpose. . For example, the ‘“‘circulation”’ of the sap is repeat- 
edly described and impressed by a diagram with arrows showing the diree- 
tion of the “ascending sap’’ and the ‘‘descending sap.” The “osmotic 
force’ is presented as “une nouvelle force,” residing in the protoplasm ia 
virtue of which it exercises “une puissante attraction.’’ Many other similar 
cases might be cited from all sections. 
The best thing about the book is the illustrations, most of which are 
excellent. But as a whole it can hardly be commended.— o- 
A NEw Part (second series, Part IV) of the A/iumesota Botanical Studies 
has appeared, bearing the date August 15, Igoo0. It contains seven papers 
of varying length, and is altogether a worthy member of the series. “A col 
tribution to the knowledge of the flora of southeastern Minnesota,” by W.A. 
Wheeler, is in the nature of a report of the work of the State Botanical 
Survey during the summer of 1899, and the results are presented with a well- 
-organized ecological background, accompanied by seven excellent plates from 
photographs showing cl teristic vegetation features. ‘“ The seed and seet- 
ling of the western larkspur (Delphinium occidentale), by Francis Ramaley, 
is a brief morphological and histological study, illustrated by a plate. “A 
‘preliminary list of Minnesota Erysiphez,” by E. M. Freeman, catalogues 
nineteen species, with their hosts. K.C. Davis publishes three important 
-revisions which have been developed in connection with the work on Pro 
fessor L. H. Bailey's Cyclopedia of American Horticulture. They ate fol 
lows : “ Native and garden Delphiniums of North America,” 52 species being 
described, one of which is new ; “ Native and cultivated Ranunculi of North 
America and segregated genera,” the genera being Batrachium &. F. 5 
(5 spp.), Ranunculus L. (96 spp., two new), Kum/ienia Greene (1 sp.), e 
Huds. (1 sp.), Cyrtorhyncha Nutt. (1 sp.), Arcteranthis Greene (I pe a 
ve 
the conclusions reached the following is of general interest: 
young mycelial threads very good evidence of the occurrence 0 
previous to, or in intimate connection with, the formation of the sp 
—jJ.M.C, 
NOTES FOR STUDENTS. 
NAWASCHIN* has recently made a cytological study of 
brassicae Woron. Plasmodiophora is a parasitic myxomycete 
various deformities and distortions in the roots of its host. 
Plasmodiopho? 
which caus 
brassicae ® 
™Beobachtungen iiber den feineren Bau und Umwandlung vom # 427 plete 
Brassicae Woron, im Laufe ihres intracellularen Lebens. Fora 86 + 404 = 
1899. ‘ 
