143 The Microscope. 



LOUISVILLE MICROSCOPICAL CLUB. 



IV/f EETING Tuesday, March 20. The president, Rev. C. J. K. 

 -*-^-^ Jones, in the chair. The regular business was discharged 

 and the club resolved to go into working session. A number of 

 objectives were examined; among them a y^-inch first-class Bausch 

 & Lomb objective recently received by Dr. H. A. Cottell. It was 

 thoroughly tested on amphipleura, including the difficult one from 

 Floyd County, Indiana. It proved a very satisfactory lens. 



Some members of the club had the pleasure of entertaining Dr. 

 Chas. Mitchell, of Nashville, Tenn., on Monday, the 19th inst. The 

 Doctor had just received a new Spencer yV-i^c'ij 130° B. A. It was 

 a beautiful working glass and the Doctor made it speak for itself. 

 The Doctor was elected an honorary member of the club. 



Contributions were received and acknowledged from the fol- 

 lowing persons: 



Miss M. A. Booth, Longmeadow, Mass. Nine slides of recent 

 and fossil diatoms, beautifully mounted and finished. 



Dr. John Sloan, New Albany, Ind., twenty-four slides of named 

 diatoms; mounted in his inimitable way. 



Simon Flexner, Sec'y. 



SAN FRANCISCO MICROSCOPICAL SOCIETY. 



THE regular meeting of this society was held January 12, 1888, 

 with Vice-President Payzant in the chair. 

 Professor H. G. Hanks read an interesting paper on " Pectolite" 

 a hydrous silicate of lime and soda. This mineral was discovered 

 and described by Von Kobel in 1828, and he gave it the name which 

 signifies "combstone," the name being suggested by its peculiar 

 structure. The mineral is rather rare, having been found at but 

 about eight localities in the world, until its recent detection in 

 California. Pectolite has several varieties which Professor Hanks 

 described. The occurrence of the mineral is very interesting. The 

 first notice of it was given in the " Fourth Report of the California 

 State Mineralogist," where C. H. Aaron found a single doubtful 

 specimen in a boulder at the foot of White Mountain in Mono 

 county. In the early part of 1887, a beautiful translucent, nearly 

 white, rock was discovered in Tehama county, which was pro- 

 nounced pectolite by Professor W. P. Blake, who was then in 

 California. 



