23 



H. F. Shepard, of Salem. Nachet and son's microscope. Attached to 

 this instrument was Nachet and son's " Cfiambre claire " or " Camera lucida." 

 To this camera can be joined, either above or below the picture, as occa- 

 isoii requires, a piece of blue glass to assist in rendering the view of the 

 pencil distinct. 



Dr. W. L. Bowdoin, of Salem. An Oberhaeuser, modele No. 2. 



Dr. G. a. Perkins, of Salem, a Nachet, moyen modele, and an antique 

 instrument made by Adams, of London, and formerly owned by the late Dr. 

 Treadwell, of Salem. 



H. F. King, of Salem. An Oberhaeuser, modele No. 2. and a Griinow's 

 Student's. 



State Normal School, Salem. A Griinow's Student's. 



Salem High School. A Mirand of English form. 



Dr. Wm. Mack, of Salem. An Oberhaeuser petit modele. 



Dr. Henry Wheatland, of Salem. A Fraiinhofer, simple model. 



Caleb Cooke, of Salem. A Mirand, petit modele, and a Kaspail. 



F. W. Putnam, of Salem. A simple English microscope, and a small 

 S Aolar's instrument of American make. 



James H. Emerton, of Salem. A Craig. 



Several other small instruments of various kinds were also in the hall, 

 making thirty microscopes in all, of twenty -five different patterns. 



After about an hour had been passed by the company in examining the 

 various objects, the Institute adjourned and a collation was partaken of, after 

 which the large hall was given up to social enjoyment, and the instruments 

 were removed to the smaller hall below, where the microscopists spent 

 several hours very profitably. Prof. Holmes had here an opportunity of 

 explaining the construction of his instrument more fully, and the fine ner- 

 vous sections which he brought were much appreciated and examined. Mr. 

 Bicknell was also able to show the capabilities of his fine instrument, and to 

 explain the pecularities of the stage movement, mirror adjustment, &c. Mr. 

 Webb also exhibited, under his binocular, gold dust and the stellate hairs on 

 the leaf of Deutzia scabra with fine stereoscopic effect. Considerable interest 

 was also evinced in the comparison of Smith and Beck's fifth with that of 

 Wales. The result was that no difference could be detected in the definitibn 

 of the object used, the pygidium of a flea, though from Wales' fifth being 

 of a larger angle it would undoubtedly have had the advantage on lined test 

 objects.^ 



Monday, May 7, 1866. Regular Meeting. 



Vice President Goodell in the Chair. 



Letters were read from Prof. A. E. Verrill, Yale College; S. E. Wright, 



Cincinnati, Ohio; Prof. Francis S. Holmes, Charleston, S. C. ; E. S. Morse, 



Portland, Me.; C. W. Bennett, Holyoke Mass.; J. A. Allen, Springfield, 



