4° 



From these experiments it will be readily seen that there are many 

 solutions that will kill the isolated nematode instantly, and there are 

 many other solutions that have apparently no effect upon them when 

 left in the solution for a number of days. Those solutions that are 

 volatile and which give off a penetrating vapor are the most effective 

 as nematode destroyers, such for example as Carbon bisulfid. Ben- 

 zole, Ammonia, Formalin, and Ammonia water from gas works, the 

 latter solution besides containing Ammonia, possesses many of the 

 coal tar products and has some value as a fertilizer when used in 

 dilutions. The most effective solutions applied were Potassium per- 

 manganate, Lime and Sugar, (Saccharate of lime), and Potassium 

 sulfid. The first named solution 1-200 killed all nematodes in three 

 hours and this strength of solution can be applied to the plants with- 

 out injury to them. The lime and sugar was made as follows : 5 

 grms. of lime were slacked in water and to it was added 5 grms. of 

 sugar to which was added 100 cc. of water, thus making practically 

 a 10% solution or 10-100. For more accurate purposes the degree of 

 alkilinity could be employed as a basis for the solutions. This was 

 reduced to various proportions. In a saturated solution of slacked 

 lime water the worms were alive and apparently well after 24 hours. 

 This experiment was not continued as it was thought to be useless. 

 In a solution of 1-250 Manganese sulfate they thrived 9 days and sim- 

 ilar results were obtained with common salt. Potassium nitrate. Mag- 

 nesium sulfate, Kainit and Sodium nitrate. Hollrung also experi- 

 mented with solutions of Kainit, Carnallit, Chlorid of Potassium 

 and Sulfate of Potash in a similar way. He employed different 

 strengths of solutions which were as follows 0.1%, 0.5%, 1.0%, 

 2.5% and 5.0%, or i-iooo, 1-200, i-ioo, 1-40, and 1-20, and exam- 

 inations were made at different periods ranging from 5 minutes to 96 

 hours. He concluded that these solutions were not capable of being 

 used as a remedy for nematodes. 



Most of the solutions enumerated in the preceding table were 

 also tried upon cucumber plants in the greenhouse which were plan- 

 ted in nematode infested soil. As a rule the pots employed were 10 

 inch ones and numerous seeds- were sown in each. The roots of the 

 seedlings were examined from time to time with the naked eye and 

 also with the microscope to ascertain whether nematodes were pres- 

 ent and the amount of infection to which they were subject. The 

 following table shows the results in a condensed form of only a few 



