i9o6. MINUTES. 273 



subsequently formed are sessile, subglobose, oblong, scattered or 

 crowded and confluent, 0.3 to 0.5 mm. broad, white or cinereous, 

 more or less warted, or veined. The sporangial wall is membranous 

 with innate clusters of white lime granules. A columella is absent, 

 or it is represented by confluent lime knots. The capillitium consists 

 of branching hyaline threads with numerous white lime-knots vary- 

 ing in size and shape, sometimes confluent in the center, or forming 

 a network with a few hyaline threads. The spores are bright violet- 

 brown, almost smooth, or spinulose, 7 to 10 /x diameter. In con- 

 clusion, it may be stated that Physarum cinereum Pers. has been 

 collected in England, France, Germany, Natal, Ceylon, Madras, 

 Pennsylvania, Iowa, South Carolina, Cuba and Paraguay, usually 

 on dead leaves. The occurrence of its plasmodium and sporangia 

 on living grass leaves is, therefore, of interest and merits the atten- 

 tion that it has received in the above description of how it has 

 changed its saprophytic habit into a grass-killing one. 



Stated Meeting November 2, ipo6. 

 President Smith in the Chair. 



The decease was announced of Mr. Cadwalader Biddle, at Phila- 

 delphia on October 28, 1906, set. 69. 



The following papers were read : 



" The Decorative Art of British New Guinea," by Dr. Alfred 

 C. Haddon, F.R.S., which was discussed by Mr. Leslie M. Miller. 



" The Effect of Sulphuric Acid on the Deposition of Metals 

 when using a Mercury Cathode and Rotating Anode," by Lily G. 

 KoLLOCK and Edgar F. Smith. (See page 255.) 



*' The Use of a Rotating Anode in the Electrolytic Precipitation 

 of Uranium and Molybdenum," by Edgar J. Wherry and Edgar 

 F. Smith. (See page 268.) 



" A Grass-killing Slime Mould," by Dr. John W. Harshberger. 

 (See page 271.) 



