Tecb. A: It 



is one source for this item which is designated as Kerr pulp 

 canal files, style D, No. 1, and are packaged one-half dozen 

 per box. 



2. Slide making can be much easier if one has forceps having fine 

 pointed tips and weak spring tension. Such forceps are best for 

 handling the glass-wool strands used for cover-glass supports 

 and for handling the cover-slips. Low-cost forceps, having the 

 desired weak spring tension, are obtainable from scientific 

 supply houses as "analytical weight" forceps. Stainless steel 

 is preferable to brass. The tips of these forceps can be filed 

 or ground to the desired shape. 



Surgical eye-knives are used for excising nematode heads and 

 tails for special slides. They are also of use in cutting the 

 body of root-knot females for identification to species by 

 perineal pattern study. These knives are made in Europe, and, 

 according to the manufacturer, they are now available in this 

 country, but only through medical supply houses. 



The company will be glad to advise of surgical distributors for 

 any locality upon writing to the Kny-Scheerer Ctorp., 35 East 17th 

 St., New York 3, N. Y. One source which has been advised of the 

 special use of these knives and stocks the item is McKessen & 

 itobbins, Inc., Surgical Dept., 1706 First Ave., BiiT.iingham 3, 

 Ala. The description of the knife is No. 322U Wheeler's dis- 

 cission knife. 



The general usefiiLness of this tool warrants purchasing two, one 

 of which should be used only for cutting nematodes. The cutting 

 edges can be renewed on a fine hone, and these knives, although 

 expensive, have a useful life of many years. Cutting nematodes 

 placed on a piece of celluloid or plastic will prolong the blade's 

 keen edge. 



3. Observation dishes for working with the nematodes should be 

 stocked in good numbers. The most useful type of dish is the 

 Syracuse watch glass; a few dozen will be needed. These dishes 

 are ver'y convenient in that they can be stacked, thus preventing 

 evaporation of the water in which nematodes are almost invari- 

 ably maintained for observation, counting, and other purposes. 



A similar type of dish, but of much smaller size, is the watch 

 glass, U. S. Bureau of Plant Industry Model, which was developed 

 for nematological work. A dozen or so of these will be found 

 useful. VJhen a small dish, having a flatter bottom surface, is 

 needed, as when counting nematodes, the 60mm. "Petri" dish may 

 be used. The Arthur H.* Thomas, Co., West Washington Square, 

 Philadelphia 5, Penn., is a source of the "B.P.I." watch glasses. 

 Syracuse watch glasses and small "Petri" dishes are obtainable 

 at all laboratory supply companies. 



