July 24, 1914] 



SCIENCE 



143 



Bacterial Content of Desiccated Mgg: L. S. Boss. 

 The results of about 550 examinations of liquid 

 and of powdered egg are given. The problem of 

 the effect of storage, both with reference to time 

 and temperature of storage, is considered. Re- 

 sults obtained in the experiment show a more rapid 

 diminution of bacteria in storage at incubator tem- 

 perature than at room temperature. The cobcIu- 

 sion is drawn also that good eggs carelessly 

 handled during process of manufacture may show 

 a greater bacterial content than eggs of suspicious 

 quality if carefully handled during the process of 

 breaking and drying. It seems possible that 

 "spots" may be made into a desiccated product, 

 which after storage for some time would give 

 satisfactory results upon a quantitative bacterial 

 examination. 



An Incubator Opening to the Outside of the Build- 

 ing: L. S. Ross. 



An incubator was placed in the basement and 

 from this a chute leads upwards and outwards to 

 an opening in the wall of the building. The pur- 

 pose of the device is to make it possible for physi- 

 cians or officers of the city board of health to drop 

 diphtheria culture tubes, submitted for diagnosis, 

 into the incubator at any hour of the day or night. 



U. 8. Kelp Investigations in Alaska: Eobeet B. 

 Wylie. 



The Pollination of Vallisnaria: Eobekt B. Wylie. 



Comparison of Field and Forest Floras in Monona 



County, Iowa: D. H. Boot. 



A study made during 1909 and 1910 of the 

 floras of typical areas in Monona oounty, Iowa, to 

 determine the relationship between them. Studies 

 made of undisturbed prairie, both exposed and 

 sheltered, of cleared forest land and of both ex- 

 posed and sheltered forest show gradual transition 

 in plant life from the most xerophytie to the most 

 hydrophytic types of habitat. No sudden breaks 

 occur as we go from one area to the next. Com- 

 plete lists of flowering plants accompany the re- 

 port. 



The Origin of the CocMeiur: Clitfoed H. FaeK. 



Notes on a Fossil Tree-fern of Iowa: Clippoed H. 

 Fake. 



The Myxomyeetes of Puget Sound: Thomas H. 

 Macbeide. 



Some Notes on the Ecology of Iowa Lichens: 



ZoE R. Feaziee. 



The following conclusions are suggested by the 

 ,work for this paper. 



Lichens vary in adaptation to habitat; this ap- 

 plies both to different species and to different in- 

 dividuals of the same species. 



Variation in habitat is 'explained, at least in 

 part, by structural adaptations. Lichens show a 

 remarkable power of resistance to drouth. 



Preliminary Beport on the Flora of Linn County: 



Ellis D. Veeink. 

 The Male Gametophyte of Ariswma: James B. 



GrOW. 



SunflecJes: W. H. Davis. 



Some Observations on Sycamore Blight and ac- 

 companying Fungi: J. P. Andeeson. 

 Introduced Plants of the Clear Creelc Canon: L. 

 H. Pammel. 



L. H. Pammel called attention to some of the 

 introduced plants of the Clear Creek "Valley, Colo- 

 rado. The first botanist to visit the region was 

 Dr. C. C. Parry, who collected in this region in 

 1861. Comparatively few alien plants have been 

 introduced; many of the introduced plants are 

 those common to the plains or boreal species. 



Weed Survey of Story County, Iowa: L. H. Pam- 

 mel AND Charlotte M. Ejng. 

 This paper gives a brief summary of the eco- 

 logical distribution of weeds on tiUed and un- 

 tilled land in central Iowa, using the quadrat 

 method of giving the distribution. 



Variation in Evaporation in Limited Areas: D. H. 



Boot". 

 Notes on Variation in Micramthes Texana: L. A. 



Kenoyee. 



In southeastern Kansas there is a very small 

 patch of a little saxifrage, Mioranthes texana 

 (Buckl.) Small. Saxifragacefe are normally 2- 

 carpellate, but in this patch the carpel number 

 varies from two to six, fluctuating around three 

 as an average. Of the 1,800 flowers examined, 83 

 per cent, have three carpels each. A mutation 

 seems to have occurred somewhere in the life his- 

 tory of this rare and little-known species, giving 

 rise to a group having three as the normal num- 

 ber of carpels. 



Barium in Tobacco amd other Plants: Nicholas 



Knight. 

 Colloidal Common Salt: Nicholas Knight. 

 The Sand of Sylvan Beach, New York: Nicholas 



Knight. 

 UvMsual Dolomites: Nicholas Knight. 

 Electromotive Forces and Electrode Potentials in 



Mixed Solvents: J. N. Peaece and W. H. Fabe. 



