146 



SCIENCE 



[N. S. Vol. XL. No. 1021 



14. The lighter the oil the more nearly white .'s 

 the flame. 



Certavn Diffraction Experiments in Sound: Harou) 

 Stiles and G-. "W. Stewart. 

 This paper describes three experiments in sound 

 diffraction, viz., the shadow of a rigid sphere, the 

 passage of sound through narrow slits and the 

 sound through circular apertures. 



Previous theoretical investigations are verified 

 to within a reasonable degree in all three experi- 

 ments. The paper is published in full in the 

 Physical Sevieiv for April, 1914. 

 The Variation of Sound Intensity with Distance 

 from the Source; An Interesting Case of Devia- 

 tion from the Inverse Square Lam: G. W. Stew- 



AET. 



This paper shows that when a source of sound is 

 located on a rigid sphere the intensity does not 

 decrease inversely as the square of the distance 

 from the source or from the center of the sphere. 

 Data are given for the variation in intensity in 

 different directions from the sphere, at different 

 distances and with a variation of wave length. 

 Notes on the Construction of Selenium Bridges: 



E. O. DrETEEICK. 



The Adaptation of Selenium to Measwrements of 

 Energy Too Small to he Measured iy Other 

 Devices: h. P. Sieg and F. C. Bkown. 



The Effect of Pressure on the Light-sensihility of 

 Metallic Selenium Crystals: P. 0. Beown and 

 L. P. Sieg. 

 Sex LinTced Factors in the Inheritance of Sudimen- 

 tary Mammce in Swine: Edward N. Wentwoeth. 

 The Effect of Calcium and Protein Fed Pregnant 

 Swine upon the Size, Vigor, Bone and Coat of 

 the Resulting Offspring: John M. Ewaed, 

 Abthub W. Dox and S. G. Gueenset. 

 To determine the relative effects of calcium and 

 protein when added to a basal ration of corn when 

 fed pregnant swine on the developing fetus many 

 separate experiments were conducted. It was 

 clearly shown that the addition of protein to corn 

 increased the size, vigor, condition, coat quantity 

 and coat covering of the offspring. Duroe Jersey 

 swine were used; these are red in color. The addi- 

 tion of calcium also increased the size, vigor, con- 

 dition, coat quantity and coat color, but not so 

 markedly as did the protein. However, the cal- 

 cium did have more effect on the bone develop- 

 ment and the condition or degree of fatness than 

 did the protein. That the addition of protein had 

 such influence upon the offspring is due in large 



measure to the fact that the corn protein is defi- 

 cient in the amino acids, tryptophane, lysine and 

 glycocoll. The source of the protein was black 

 albumen, whereas the calcium was furnished in the 

 form of both chloride and carbonate. The car- 

 bonate was found to be more e£S.cacious than the 

 chloride, presumably because it did not induce 

 acidosis as the chloride probably did. 

 A Study of the Crow: Feank 0. Pellett. 

 Butterflies of Chance Occurrence in Cass County: 



Frank C. Pellett. 

 Nature and Birds: Feed Beeninghausen. 

 Color Vision in Animals: Mabel C. "Williams. 

 Effect of Low Temperature on the Oyster-shell 



Scale, Lepidosaphes TJlmi Limn: K. L. Webstee. 



The effect of the low temperatures of January, 

 1912, on the eggs of the oyster-shell scale in Iowa. 

 An account based on samples of scale sent in a 

 year later. In most cases the eggs had been killed 

 by the severe winter. 

 A Catalogue of the Lepidoptera of Linn County: 



Geoege H. Beeey. 

 Notes on- Variation in Micranthes Texana: L. A. 



Kenoyee. 

 Coleoptera of Henry County, Iowa: Inez Naomi 



King. 



There are listed about 500 species of Coleop- 

 tera representing those that are known to occur in 

 Henry county, Iowa. Most of these species have 

 been collected by the author during the years 1912, 

 1913 and 1914. 



"The Coleoptera of Indiana," by W. S. 

 Blatchley, has been used for the larger part in 

 naming the specimens taken, although some of the 

 names have been determined through various 

 sources. 

 An Observation of Longitudinal Division of Bydra: 



L. S. Ross. 



An account of the observation of two specimens 

 of the brown Bydra in the process of longitudinal 

 division, one being divided through the length of 

 the body to the foot, while the other had divided 

 through the hypostome and only a short distance 

 into the body. Also a brief account of the acci- 

 dental injury of one of the tentacles resulting in 

 the union of two tentacles into a loop that per- 

 sisted a few days and then separated again into 

 two distinct tentacles. 

 A Convenient Table for Microscopic Drawing: L. 



S. Boss. 



James H. Lees, 



Secretary 



