134 KANSAS ACADE3IY OF SCIENCE. 



excepting Cysto23us candidus in the oospore-bearing distortions on Brassica nigra. 

 But the oospores, after once being formed ( during May and June ?), could, of course, 

 endure any kind of weather. These facts would go to show that under some con- 

 ditions at least Peronospora Euphorbiae should be classed as a drought-resisting 

 species. It is an interesting fact that during dry or otherwise unfavorable times, 

 the various species of Peronosporace disappear entirely from their rarer hosts and 

 attack, to a lessened degree, only their most common hosts. For instance, here 

 Peronospora Euphorbiae is found on Eupihorbia hypericifoUa only during favorable 

 Peronospora weather, and then only in small quantity. During dry weather I have 

 as yet failed entirely to find it on this host. These facts might indicate a closer 

 adaptation of the Peronospora for some hosts than for others, and hence, under 

 unfavorable conditions, only those hosts would be attacked to which the parasite was 

 most perfectly adapted. Of course, in some cases, the habitat (on high, dry land 

 for instance) of the supporting plant might hinder the spread of the parasite, al- 

 though the parasite were perfectly adapted to its host. 



32. Peronospora sordida Berkeley. 



On Scroiihularia nodosa L. 



1993, June 2, 1890, Manhattan. 



Including the additions given in this paper, there are now known from Kansas 

 33 species of Peronosporaceae, on 71 different host plants, entering the hybrid 

 varieties of cultivated grape as 1 species. 70 of these host plants are dicotyle- 

 donous phanerogams, and 1 (Setaria) a monocotyledonous phanerogam. 31 species 

 on 67 host plants occur within a radius of ten miles from Manhattan, Kansas. 



ON THE GERMINATION OF INDIAN CORN AFTER IMMERSION IN HOT 



WATER. 



BY W. A. KELLEKMAN, PH. D. 



Numerous trials were made in July and August to determine the germination of 

 Indian corn after immersion for one-third of a minute to twenty minutes in water 

 ranging in temperature from 56° C. ( 132.8° F.) to 88^° C. (199°F.). 



The temperature of the water in the vessel was kept, during the immersion of 

 the grain, at the desired temperature by addition of cooler or warmer water as re- 

 quired. 



After immersion the grain was plunged into cold water in order to cool it rap- 

 idly. While in the vessel of hot or cold water, the wire basket containing the grain 

 was given repeatedly a whirling and a plunging motion, so that every grain might 

 surely be subjected tb water of the same temperature the entire time of immersion. 



After the above treatment the grain was at once planted, either in a Geneva 

 tester kept indoors, or in the ground. The results of the germinations are given in 

 the extended tabulation below. 



The varieties of corn used were St. Charles and Normandy Giant {white), Learn- 

 ing and MUrdock's {yellow). Thoroughbred Flint, Mason's flour corn {soft). Shakers 

 Early Sweet and Pop corn. The change from St. Charles to Normandy Giant, and 

 from Learning to Murdock's, was necessitated by insufficient quantity of the first 

 variety in each case, but the germinative capacity was tested in each case and they 

 were found to be identical. Therefore, the results are not vitiated by this enforced 

 change. 



The grains in the tester germinated in two or three days, but usually six or seven 



