70 



SCIENCE 



[N. S. Vol. XLIV. No. 1124 



"Axone Hillock" of Crayfish Nerve Cell (illus- 

 trated) : L. S. Ross. 

 A Malignant Tumor of a Chicken Liver, a Demon- 

 stration: L. S. Boss. 

 Notes on Two Strawberry Slugs: R. L. Webster. 



An account of two strawberry insects that have 

 been frequently confused in the literature of eco- 

 nomic entomology. 

 A Method of Preparing Studies of Trichinella 



spiralis Owen: Dayton Stonee and Thesle T. 



Job. 

 Life History and Habits of the Gold-banded Paper 



Maker, Polistes metricus Say: Frank 0. 



Pellett. 

 Distributional Notes on Some Iowa Pentatomoidea: 



Dayton Stoner. 

 An Hermaphrodite Crayfish: Ivan L. Resslee. 

 The White Admiral or Banded Purple Butterfly 



in Iowa: B. O. Wolden. 

 Notes on the Little Spotted Skunk: B. H. Bailey. 

 Successful Mink Farming in Iowa: B. H. Bailey. 

 A Handy Device for Staining Slides : E. Lawrence 



Palmeb. 



The simple staining apparatus demonstrated was 

 devised to take the place of the more expensive 

 staining jars sold by most of the scientific supply 

 houses. Besides the cheapness of the outfit, which 

 fits into any tumbler, there is the added advantage 

 that all of the slides being stained may be removed 

 from the jar at once and may be rinsed while still 

 in the frame. Fourteen slides may be inserted into 

 the frame at one time, which is four more than the 

 average staining jar holds. 



The device is made by bending eight strips of 

 zinc 15 X 200 mm. into the channels (a). These 

 are soldered to the 20 X 140 mm. zinc strip ( 6 ) 

 which is then bent into a rectangular form with the 

 channels on the inside. The strip (c) 1 X 26 cm. 

 is then soldered to the ends of the strip (6), form- 

 ing a handle with which to lift the frame, and a 

 guard to prevent the slides from falling out at 

 the bottom. 



This piece of apparatus has proved particularly 

 handy in staining work where most of the slides 

 require the same treatment. 



A Seed Key to Some Common Weeds and Plants: 



E. L. Palmer. 



This preliminary key to the seeds and fruits of 

 one hundred and eighteen of the common weeds 

 and plants of northeastern United States uses ex- 

 ternal characters as a basis for classification and 



arranges the seeds according to size. Most keys 

 are made on a strict diehotomous plan. In this 

 case, however, those seeds whose length is between 

 1 and 2 mm., between 2 and 3 mm., etc., are con- 

 sidered separately. After this step, one finds the 

 key on a strict diehotomous plan. The possibility 

 of entering the key at a number of places lessens 

 the number of decisions to be made in determining 

 the individual and consequently increases the prob- 

 ability of correct determination. Besides detailed 

 descriptions of all the seeds mentioned in the key, 

 there are pen and ink sketches of forty-one of the 

 more typical forms considered. 

 The Growth of Legumes and Legume Bacteria in 



Acid and Alkaline Media: R. C. Salter. 

 A Forest Census in Lyon County, Iowa: David H. 



Boot. 

 The Preservation of Fleshy Fungi for Laboratory 



Use : Guy West Wilson. 

 Notes on some Peliate Hydnaceas from Iowa: Guy 



West Wilson. 

 Scleroderma vulgare and its Allies: Guy West 



Wilson. 

 Some Observations on California Plants: L. H. 



Pammel. 

 Some Observations on the Weeds of California: L. 



H. Pammel. 

 A Record of Fungus Diseases: L. H. Pammel and 



Charlotte M. King. 

 Hoiv a Tree Grows : Fred Berninghausen. 

 Notes on the Pollination of Some Plants: Robert 



L. Post, presented by L. H. Pammel. 

 Notes on Anatomy of the Leaves of Some of the 



Conifers of North America: L. W. Durell, pre- 

 sented by L. H. Pammel. 

 Notes on the Flora of Sitka, Alaska: J. P. Ander. 



son. 

 Notes on a Cultivated Elodea: R. B. Wylle. 

 Insect Pollination of Frasera stenosepala: L. A. 



Kenoyer. 

 Insect Pollination of Timber Line Plants in Colo- 

 rado: L. A. EJENOYER. 



Pioneer Plants on a New Levee, II.: Frank 



Thone. 



The paper is a condensed summary of late de- 

 velopments on the area discussed in a paper pre- 

 sented at the 1915 meeting of the academy. 

 The Control of the Oats Smut by Formalin 



Treatment : J. A. Krall. 

 Late Blight Epidemics in Iowa as Correlated with 



Climatic Conditions: A. T. Erwin. 



