1906] CURRENT LITERATURE 215 
In spite of some minor things which seem inseparable from originality, this 
work is of the first quality and should be in the hands of every plant pathologist. 
—H. A. Harpine. 
MINOR NOTICES. 
Grasses of Iowa.— As a supplementary report for 1803 the Iowa Geological 
Survey issues part u of the Grasses of Iowa,? prepared by PAmmet, BALL, 
ScCRIBNER, and others. This is a descriptive and geographical study of the 
grasses of the state, their general and economic aspects having been treated in 
part 1. Under each genus there is the generic description, with synonymy, a 
key to the species, a description of the species, often a figure, a list of localities 
and a map showing the distribution of each form in the state, and a statement of 
distribution in North America and elsewhere. There isa chapter on physiography 
and geology, with a map, a section onecology, and a partial bibliography of 
works on grasses. The work seems very complete and should be especially 
serviceable to Iowa botanists. It is a pity state printers are so seldom skilfuy 
ook-makers.—C. R. B 
Connecticut fungi.— The recently established natural history survey of Con- 
necticut has begun to show results, in the publication of two bulletins listing 
the Hymeniales and Ustilagineae of the state. The formers lists 375 species in 
65 genera, gives analytic keys to the genera, and illustrates the commoner species 
by admirable half-tones, most of which are original. The species of smuts+ are 
described with lists of hosts and distribution, and notes on economic features.— 
oe 
NOTES FOR STUDENTS. 
Photosynthesis and temperature.—The interesting results of Miss iia 
on temperature as a limiting factor for photosynthesis’ have now been extended 
by her work in cooperation with BLACKMAN. ey have endeavored to 
interpret the quantitative variations of photosynthesis, under approximately 
natural conditions, in terms of the three limiting factors thereto, viz. (1) intensity 
of illumination, (2) temperature of leaf, (3) pressure of CO,. When a leaf is 
- 2PamMeL, L. H., Batt, C. R., and ScriBNer, F. L. The grasses of Iowa. 
Part 0, Iowa Geological Survey, co report. 1903. 8vo. pp. xiv+ 436, 
figs. 270. Des Moines, Iowa. 1904 
3 WHITE, E. A., A pr re report on the Hymeniales of Connecticut. State 
Geol. and N. H. Survey Bulletin 3. 8vo. pp. 81. pls. 4O. 1905. 
4CLinTon, G. P., The Ustilagineae or smuts of Connecticut. Idem, Bull. 5. 8vo, 
Pp. 45. figs. 55. 190 
5 See Bot. GAZETTE 38 : 476. 1904. 
BLackan, F. F., and Matraaet, G. L. C., Experimental researches in vege- 
table assimilation and reanirations. IV. A quantitative study of carbon dioxide assim- 
ilation and leaf temperature in natural illumination. Proc. Roy. Soc. London B. 
76: 402-460. 1905. 
