370 
Botanical Notes. 
Tumble mustard. A species of mustard that promises to be 
one of the most formidable tumbleweeds yet introduced in the 
United States has been found by Mr. J. H. Sandberg and Mr. J. 
M. Holzinger, well established as a roadside weed in the side 
streets of Minneapolis. It is Sisymdrium altissinum L. This 
species was collected on ballast ground at Philadelphia in 1878, 
and in 1885 it was found near Castle Mountain on the western 
boundary of Alberta. During the past five years it has become a 
troublesome weed in the vicinity of Indian Head, Assiniboia. It 
is there known by the very appropriate name of “tumble mustard.” 
It has also been found at Ottawa, Canada. 
The tumble mustard may be distinguished from the other 
mustards by its slender siliques, 3 to 5 inches long, and by its 
characteristic tumbleweed habit, making a rather dense bush-like 
plant at maturity. If discovered elsewhere than in the five places 
mentioned, the undersigned will be grateful for reports of the lo- 
calities. In case of doubt as to determination franks will be sent 
for mailing and the specimens will be determined at the National 
Herbarium. Lysrer H. DEWEY. 
WasuincTon, D. C., August 14, 1895. 
Reviews. 
A Manual for the Study of Insects. John Henry Comstock 
and Anna Botsford Comstock. 8vo., pp. 7o1. Ithaca, N. Y- 
Comstock Publishing Company. 1895. 
The entomological sky has become much cleared, so far as 
the student or beginner is concerned, by the publication of this 
Manual for the Study of Insects. There should be no difficulty 
now in determining in nearly every case the native insects as far 
down the scale of classification as the families to which they 
scientifically belong. This is made possible by numerous figures 
and tables of classification for each order, coupled with a general 
clearness of statement that does not bristle with an array of 
scientific terms. The book is essentially about insects and not 
