The Microscope. 243 



Dr. Thomas Morffew's exhibit illustrated veiy finely the struc- 

 ture of human teeth. Longitudinal sections of an incisor, a cuspid 

 and a molar were shown and their characteristics duly explained. 



Dr. S. M. Mouser, with a very fine array of instraments, exhib- 

 ited an interesting slide of Trichina spiralis, and also a series of 

 pathogenic micro-organisms grown in his biological laboratory, and 

 shown under high-power objectives, giving exquisite definition. 



The lingual ribbon or tongue of Haliotis, exhibited by W. F. 

 Myers, strikingly illustrated the characteristics of this peculiar 

 organ of the MoUuscoe. The beautiful iridescent shell of this animal 

 was also shown, both microscopically and in its entirety. 



The resplendant scales of the diamond beetle were shown by 

 Charles C. Riedy under a microscope interesting from its having 

 been in use for half a century. He also exhibited the well-known 

 test diatom Pleurosigma angulatum under an amplification of 2,000 

 diameters. The most attractive objects in his exhibits, however, were 

 the' beautiful shells of Foraminifera shown by the cool, dark-ground 

 illumination obtained by the Bausch & Lomb-Abbe condenser. 



Sand from Alameda beach formed an attractive object as shown 

 by Dr. Riehl, who also exhibited living diatoms in active motion, col- 

 lected in San Francisco Bay. 



Dr. J. M. Selfridge presented an attractive exhibit, comprising 

 a very fine mount showing the villi in duodenum of rabbit, another 

 of the beautiful crystals of cinnibar, and last, but by no means least, 

 the circulation of the blood in the mesentery of the frog. 



Dr. J. H. Stallard's exhibit was the largest in the hall, he hav- 

 ing no less than thirteen microscopes under his charge. The entire 

 series was devoted to illustrating the stnicture of both normal and 

 diseased human lungs. The slides shown were all masterly prepar- 

 ations, and the opinion was universally expressed that the entire ex- 

 hibit formed the finest presentation of the subject ever seen here. 



The subject chosen by the President of the Society, E. J. Wick- 

 son, was that of "Insect Fruit Pests." Living individuals of the Cot- 

 tony Cushion Scale and the San Jose Scale were shown, and also 

 specimens of the egg deposit of the Lecanium Scale, and of the 

 larval form of Chicolorus bivulneris. Colored engravings, showing 

 the appearance and ravages of some of these little destroyers were 

 also exhibited. Mr. Wickson's table was the last on the programme, 

 and its inspection brought to a close an entertainment which must 

 be pronounced an unqualified success. 



A. H. Brechenfeld, Secretary. 



