33 



minations of the species. One of the most interesting parts of 

 the work is the treatment of i6 galls on cryptogams. The work 

 closes with a bibliography of 204 titles. 



This line of work which has received so much attention in 

 Europe has been greatly neglected in America, but with the 

 increasing interest in evolution, biochemistry, physiology and 

 plant pathology the time is not far distant when it must become 

 one of our most interesting and productive lines of botanical 

 research. It is a field in which our American botanists must 

 soon follow the lead of their European colleagues. However, 

 it is unfortunate that in both Europe and America, the myco- 

 cecidia have received much less attention than the zoo-cecidia. 



Mel T. Cook 



Hawkins, L. A. The influence of calcium, magnesium and 

 potassium nitrates upon the toxicity of certain heavy metals toward 

 fungus spores. Physiological Researches 2: 57-92, 1913. Mr. 

 Hawkins has shown that, in certain cases, the effect of a toxic 

 salt on the germination of the conidia of Glomerella cingulata 

 may be influenced by the addition to the medium of calcium, 

 magnesium or potassium nitrate. For the combination of Cu- 

 (N03)2 with Ca(N03)2 and of Zn(N03)2 with Ca(N03)2 and 

 Mg(N03)2, he has shown that this effect is not due to the forma- 

 tion of undissociated double salts. He has also shown that it is 

 not due to the depression of the ionization of the toxic salt. The 

 salts which he tested, given in the order of their toxicity, are as 

 follows: Cu(N03)2, CUSO4, Pb(N03)2, A1(N03)3, HNO3, Zn(N03)2, 

 Ni(N03)2, M^(N03)2, Ca(N03)2, and KNO3. 



L. O. KUNKEL 



Hans Kniep, Beitrage zur Kenntnis der Hymenomyceten I, II. 

 Zeitschrift fiir Botanik, 5: 594-637. Au 1913, reports another 

 effort to discover the origin of the binucleated cells in the hy- 

 menomycetes. The work, as the title indicates, is divided into 

 two parts. The first is devoted to a study of a new species, 

 Hypochnus terrestris Kniep. The author traces the development 

 of this form from spore to spore and shows that there are no 

 sexual organs or their equivalents. The spore prior to germina- 



