1892.] MICROSCOPICAL JOURNAL. 205 



& Whitney, of Hartford, for the R. Hoe & Co. printing-press 

 manufacturers. This screw, considering its great length, was 

 found to be of exceptional accuracy. 



Thursday Afternoon. 



Professor E. H. Griffith, of Rochester, N.Y., read several papers 

 in the afternoon descriptive of a new microscope and of new 

 microscopical accessories. The instrument is the invention of 

 Mr. Griffith himself and is manufactured by the Gundlach Opti- 

 cal Company. The principal features of the improvements are 

 its portability, packing as it does in small cases, and a ceiitering, 

 swinging, and removable substage. The Griffith microscope 

 lock, a device which can be attached to any microscope, was also 

 described. It securely locks the adjustments and prevents acci- 

 dents to objectives and slides. Mr. Griffith also gave an account 

 of another improvement recently devised by him and put into 

 practical use. This is a cover-glass micrometer to be attached 

 to the turn-table. He also has a new substage diaphragm. The 

 use of the latter is to I'egulate the intensity of the light. 



Frank Zentmayer read a paper describing a microscopic stand 

 recently invented by him for the University of Pennsylvania. It is 

 intended to be a combination of the best features of the American 

 and Continental microscopes. One 'of the new features, and an 

 American feature at that, is an aluminum stage. This is the first 

 time aluminum has been employed by microscope manufacturers, 

 and Mr. Zentmayer expressed the opinion that the use of alumi- 

 num would soon be more extended, as the metal does not corrode 

 by contact with acids, which themicroscopist is often called upon 

 to examine. 



Other papers were presented at to-day's meeting by Professor 

 Kellicott, Dr. Munn, G. W. Rafter, Dr. Mercer, and M. L. Hol- 

 brook. 



Later in the afternoon the members and friends took cars at the 

 university for the Bausch & Lomb Optical Company's factory, 

 where the remainder of the afternoon was utilized in an inspec- 

 tion of the works. 



Thursday Evening — The Soiree. 



As at all previous meetings, the soiree was the notable feature 

 of the assembly of microscopists. At 8 o'clock the microscopes 

 were all in place and the exhibit was in full progress. 



Most of the objects exhibited were of a popular nature rather 

 than of the most particular scientific interest. Among them were 

 exquisite histological specimens, diatoms, metals, disease growths, 

 tissues, forms of vegetable and animal life, bacteria, trichinae, 

 gold, hairs, teeth, crystal, &c. 



A few of the more important exhibits were as follows : 



By Dr. F. D. Andrew, Rochester. — Human lung ; and growing 

 bone. 



