Maech 31, 1922] 



SCIENCE 



353 



G70JN (^70ZP Pui-ex 



i-yr.-^ 



h 





a 



y^. 





G70ZP 



F'lq. 



A seal using only G702P and Pyrex may be 

 made as indicated in Fig. 2. Join tube of 

 G702P to Pyrex and draw down as indicated. 

 The wire coated with a small bead of G702P 

 (or even the bare clean wire) may be placed 

 in position, Fig. 2-a, and the seal made by 

 squeezing with tweezers when hot. Squeeze as 

 soon as possible to prevent oxidation. This 

 seal may also be made by squeezing a bead of 

 G702P in a Pyi-ex tube but with less freedom 

 from breakage. 



To join copper to tungsten: 



(a) electroplate tip of tungsten wire with 

 copper or nickel and solder (silver solder for 

 higher temperatures). 



(b) melt nickel wire to tungsten in oxygen 

 flame using borax as flux or even no flux. Nick- 

 el becomes very brittle and it is best to then 

 solder to the nickel bead thus obtained. 



(e) form arc of 10 to 20 amps, between 

 tungsten and nickel wires to coat tungsten \vith 

 nickel; solder. 



(d) German silver (for this use of it I 

 am indebted to Mr. Cummingsi of the Depart- 

 ment of Chemistry of this University) flows 

 much better than nickel. Use method (b) with 

 borax as flux. Copper wire may be joined at 

 once in flame just as in joining copper to 

 platinum. 



The method used will generally depend upon 

 facilities available. 



L. T. Jones 

 Department op Physics, 

 University of California 



A NEW SCLEROTINIA ON MULBERRY 



A DISEASE of mulberry characterized by en- 

 larged portions of the fruit has been noted by 

 Orton^ and more recently by Taubenhaus.^ 

 The authors have found a species of Sclero- 

 tinia to be the cause of this disease and will 

 describe it as follows in the Journal of Agri- 

 cultural Mesearch: 

 Sclerotinia carunculoides n. sp. 



Apothecia one to several from a single scle- 

 rotium, disc cupulate to sub-cupulate ; 4 to 12 

 mm. in diameter; inside snufE-brown,^ outside 

 Prout's brown; stalk cylindrical, flexuous, 

 smooth, attenuated downward, 15 to 42 mm. in 

 length, reaching a diameter of 1.5 mm., color 

 Prout's brown; asci cylindrical to eylindi-o- 

 clavate, 104 to 123 x 6.4 to 8 [x, average 117 x 

 7 u., 8-spored; ascospores uni-seriate, reniform, 

 hyaline, 6.4 to 9.6 x 2.4 to 4 (a, average 7.6 x 

 3.1 u., with 2 bodies on the concave surface; 

 namely, a body more or less rhombic in shape 

 as seen from above, 2 x 4 n, and adjoining 

 it, a more or less hemispherical body 3 [A in its 

 longest diameter; paraphyses filiform to cylin- 

 dro-elavate, simple or branched, septate or non- 

 septate, 94 to 128 X 1.8 to 2 [I.; microeonidia 

 hyaline, sub-globose, 2 to 4 x 2 to 3.2 (a, aver- 

 age 2.8 x 2.5 [i; selerotia black, fairly regular, 

 sub-spherical with depressed surfaces. 



i Experiment Station Record, Vol. XIV, No. 6 

 pp. 3.51-352, 1903. 



= Nature Study Review, Vol. 17, No. 7, pp. 282- 

 28.5, 1921. Illus. 



3 Eidgway, Eobert, Color standards and color 

 nomenclature, 43 p., 53 col. pi, Wasliington, 

 D. C, 1912. 



