proceedings: Washington academy of sciences 603 



Mr. Louis J. Gillespie, Bureau of Plant Industry, U. S. Depart- 

 ment of Agriculture, Washington, D. C. 



Mr. R. B. Harvey, Bureau of Plant Industry, U. S. Department 

 of Agriculture, Washington, D. C. 



Mr. Oliver Baker Hopkins, U. S. Geological Survey, Washington, 

 D. C. 



Mr. James A. Hyslop, Bureau of Entomology, U. S. Department 

 of Agriculture, Washington, D. C. 



Mr. James T. JardinE, U. S. Forest Service, Washington, D. C. 



Mr. Neil M. Judd, U. S. National Museum, Washington, D. C. 



Dr. Lyman Frederic KeblER, Bureau of Chemistry, U. S. Depart- 

 ment of Agriculture, Washington, D. C. 



Dr. George Richard Lyman, Bureau of Plant Industry, U. S. De- 

 partment of Agriculture, Washington, D. C. 



Mr. S. C. Mason, Bureau of Plant Industry, U. S. Department of 

 Agriculture, Washington, D. C. 



Dr. Everett Franklin Phillips, Bureau of Entomology, U. S. 

 Department of Agriculture, Washington, D. C. 



Mr. Fred J. Pritchard, Bureau of Plant Industry, U. S. Depart- 

 ment of Agriculture, Washington, D. C. 



Mr. Arthur W. Sampson, U. S. Forest Service, Washington, D. C. 



Mr. E. Ralph Sasscer, Bureau of Entomology, U. S. Department 

 of Agriculture, Washington, D. C. 



Mr. Joshua J. Skinner, Bureau of Plant Industry, U. S. Department 

 of Agriculture, Washington, D. C. 



Robert B . Sosman, Corresponding Secretary. 



134TH meeting 



The 134th meeting of the Academy was held jointly with the Chem- 

 ical Society of Washington in the Assembly Hall of the Cosmos Club, 

 the evening of Thursday, March 27, 191 9. Dr. Arthur L. Day, 

 Director of the Geophysical Laboratory, Carnegie Institution of Wash- 

 ington, and Vice-President of the Corning Glass Works, Corning, New 

 York, delivered an address on Optical glass. The lecturer outlined 

 the position of the United States with respect to supplies of optical 

 glass both in 19 14, when imJDorts from Europe began to be interrupted, 

 and in 191 7, when the United States entered the war. The danger 

 from American dependence on European supplies had been recognized 

 before 191 7 and some progress had been made in this country in the 

 manufacture of optical glass; but the situation was unsatisfactory, 

 because the prospect that the supply would increase with sufficient 

 rapidity to keep pace with the demands of the American Army seemed 

 remote. Intensive efforts to stimulate the production of the one plant 

 that was then producing glass in appreciable quantity, and the 

 bringing into production of two additional commercial plants in the 

 latter part of 191 7, had by November, 191 8, solved the problem of an 

 adequate supply. At the same time laboratory and plant research 

 had secured improved raw materials and had gotten at the many diffi- 



