208 Agricultur, etc. — Methoden. — Personalnachrichten. 



busheis per acre, mostly 35 to 75 bu. per acre (30 tot 66 hectoliters 

 per hectare). 



The best ear out of the 150 samples was compared in detail 

 with a prize ear that sold at auction for $ 150 in Iowa. As the 

 measurements may be of interest in other parts of the world they 

 are given below both in English and metric units. 



Iowa ear. Delaware ear. 



English. Metric. English. Metric. 



Length 10.1/4 in. 26 cm. 10.1/4 in. 26 cm. 



Circumference 3 in. from base 7.7/8 in. 20 cm. 7.1/2 in. 19 cm. 

 Circumference 2 in. from tip 6.7/8 in. 17.5 cm. 6.5/8 in. 17 cm. 



Rows of kerneis 20 16 



Weight of ear 19 oz. 539 gr. 16.6 oz. 473 gr. 



Depht of kerneis 19/32 in. 15 mm. 18/32 .in. 14.3 mm. 



Width of kerneis 10/32 in. 7.9 mm. 12/32 in. 9.5 mm. 



Thickness of kerneis . . . 9/48 in. 4.7 mm. 8/46 in. 4.3 mm 



Photographs of both ears are reproduced in fig. 2. 



W. T. Swingle. 



'&' 



Henderson, L. F., Destruction of dandelions. (Annual Report 

 for 1905, Idaho Agricultural Experiment Station Moscow, Idaho, 

 p. 19—20. 1906.) 



Dandelions {Taraxicmn dens leonis) growing in lawns were 

 not killed by cutting off below the ground nor by drenching with 

 brine or kerosine even when first cut off below the ground pulled 

 out to permit of the brine or oil being poured on the root. They 

 Avere killed, for the season at least, by pouring gasoline on the 

 expanded plant or on the root. The gasoline treatments did not 

 härm the grass whereas the oil and brine killed the grass without 

 injuring the dandelions W. T. Swingle. 



Gager, C. S., Radium in Biological Research. (Science. N. S. 

 XXV. NO. 641. p. 589—590. Apr. 12. 1907.) 



Radioactive microscopic slide made by evaporating a Solution of 

 radium bromide and protecting the film with "a specially prepared 

 substance." Living cells may be mounted on slide in the ordinary 

 way. The electrification of paraffin ribbons of the microtome can 

 be avoided by ionizing the air near the paraffin block by means of 

 a celluloid rod coated with radium. Slides and rods are made by 

 H. Lieber & Co., New York City. W. T. Swingle. 



Personalnaehriehten, 



Ernannt: Zum ordentl. Professor der Botanik an der Universität 

 Santiago de Chile, Dr. F. Johow an Stelle des Herrn Fed. Philippi. 



Ausgegeben: ST' Augustus löO'J'. 



Verlag von Gustav Fischer in Jena. 

 Buctidruckerei A. W. Sijthoff in Leiden. 



