240 



SCIENCE 



[N. S. Vol. XXXVIII. No. 972 



The Effect of SmoTce and Gases upon Vegetation: 



A. L. Bakke. 



Industrial centers have succeeded in having as- 

 sociated with them a large quantity of smoke. 

 Under ordinary conditions the amount of smoke 

 decreases with the increase of the distance from 

 the business center. In making a study of two 

 smoke districts of Chicago it has been found pos- 

 sible to use plants as an index to the amount of 

 smoke present. 

 Aroid Notes: James Ellis Gow. 



The taxonomy of a number of species of Aroids, 

 chiefly tropical, has been worked out and is here 

 presented for the first time. 

 Phylogeny of the Monocotyledones : James Ellis 



Gow. 



Eesearches on the morphology of the Aroids, 

 with special reference to the phylogeny of the 

 group, have led the author to question the theory 

 as to the primitive character of the nionocotyle- 

 donous plants; and he here defends the view that 

 the most primitive forms are to be found among 

 the spiral Dicotyledones. 



The Grasses of the Uintah Mountains and Adja- 

 cent Begions: L. H. Pammel. 



Brief account of grasses collected in the Uintah 

 Mountains and the adjacent regions based on 

 collections made by the writer during several sea- 

 sons in which the flora of the region was studied. 

 The paper records the habitats, distribution and 

 abundance of the species. 

 Notes on the Flora of Johnson County, Iowa: 



M. P. Somes. 



An annotated list of plants observed growing in 

 Johnson County, Iowa, comprising 1,008 species, 

 representing 413 genera, included in 101 families. 

 Not including mosses, fungi or the other crypto- 

 gams lower than the ferns. 



The Electrical Conductivity of Solutions of Elec- 

 trolytes in Aniline: J. N. Peaece. 

 Equilibrium in the System; Cobalt Chloride-pyri- 



dine: J. N. Pearce and Thomas E. Moore. 

 The Osmosis of Optical Isomeres: A. K. Johnson. 

 Observation on the Specific Seat of Milk and 



Cream: Johnson and Hammer. 

 A New Design for Specific Apparatus: Johnson 



and Hammer. 

 A Proposed Method for Determining the Batio of 



Congealed to Vncongealed Water in Frozen 



Soil: Johnson and Rat Smith. 

 Factors in Milk Production: Frank B. Hills. 



By a microscopical examination of many sam- 



ples of milk of different fat composition per- 

 centages, numerous counts were made of the num- 

 bers of fat globules of different sizes. A positive 

 relation was found to exist between the per- 

 centage fat composition of the milk and the num- 

 bers of globules of different sizes, the correlation 

 coefficient being .19. A study of the tabulated fat 

 records of about 3,700 pairs of variates, taken 

 from the Advanced Register Year Book of the 

 Holstein Friesiau Association, showed by a cor- 

 relation coeflScient of .29, evidence of so-called 

 prepotency of dams in the transmission of fat 

 production to their daughters. This would indi- 

 cate a probable sex linkage of some of the factors 

 in the inheritance of fat production. A rearrange- 

 ment of the data into groups for the study of the 

 fat production of three consecutive generations of 

 animals showed segregation of fat factors in a 

 7 : 1 ratio, giving further evidence of linkage of 

 some of the factors in the inheritance of fat con- 

 tent in milk. 



Nitrogen and Chlorine in Bain and Snow: Nich- 

 olas Knight. 



Twenty-six specimens of rain and snow were 

 carefully collected during the year 1911-12, and 

 the amount of nitrogen in the nitrites, nitrates, 

 free and albuminoid ammonia estimated. The 

 amount of nitrogen that an acre of land received 

 from each precipitation was computed. Chlorine 

 was found in each specimen in which it was 

 sought. This must come from the oceans as com- 

 mon salt. 



Exhibition of Barograph and Thermograph Tra- 

 cings of the Omaha Tornado: John L. Tilton, 

 The Limestone Sinks of Floyd County, Iowa: A. 



O. Thomas. 

 Notes on the Nebraskan Drift of the Little Sioux 



Valley in Cherokee County: J. E. Carman. 

 The Wisconsin Drift-plain in the Begion about 



Sioux Falls, South DaJ:ota: J. E. Carman. 

 Some Additional Evidence of Post-Kansan Drift 

 near Iowa City, Johnson County, Iowa: Morris 

 M. Leighton. 

 The Bock from, Solomon's Quarries: Nicholas 

 Knight. 



A specimen of what is locally known as the 

 ' ' Royal ' ' was received from Jerusalem for an- 

 alysis. It was of the purest white, soft when first 

 removed from the quarry, but it soon hardens on 

 exposure to the air. The rock is very pure cal- 

 cium carbonate, with little more than a trace of 

 magnesium carbonate. 



