SCIENCE-ADVERTISEMENTS 



Designers and Manufacturers of Standard 



Tuning Forks and Resonators 



for all uses 



Helmholtz Resonators 



Now made from our New Dies Lists and information on request 



Standard Scientific Company 



Manufacturers and Dealers In 



Scientific Instruments and Laboratory Supplies 



147-153 Waverly Place 

 NEW YORK 



Dry Microscopic Stains Always in Stocl^ 



Azolitmin per 10 gr $2.00 



Azur I per gr 2.25 



Azur II per gr 1.25 



Azur n Eosin per gr 1.75 



Acid Fuchsin per oz 1.50 



Basic Fuchsin per oz 1.50 



Bismarcli Brown per oz 1.00 



Brilliant Green per 10 gr 60 



Congo Red per oz 1.00 



Eosin Water & Ale. SoL.per oz 1.65 



Erythrosin per oz 1.50 



Gentian Violet per oz 1.50 



Methyl Violet per oz 1.00 



Methyl Orange per oz 1.00 



Methyl Red per oz 2.50 



All of the above named dry stains are manufactured by experts from guaranteed imported crude 

 ingredients, thoroughly tested by the best authorities, and have been sold for the past four years through- 

 out the country, to the satisfaction of the most critical technic. 



(All material marked " x " is of the Badische and Berhn Aniline Works.) 



Safranin per oz $1.50 



Wright Stain per gr 45 



Jenner Stain per gr 45 



Hasting nach Jenner per gr 70 



Methylene Blue F.B per oz 1.00 



Methylene Blue Med per oz 1.50 



Haematoxylin U. S. A per 10 gr.. 



X Polychrome Methylene Blue per 10 gr.. 



X Crystal Violet per 10 gr.. 



X Uranine per 10 gr.. 



X Methyl Green per 10 gr.. 



X Alkali Blae per 10 gr.. 



X Biebric Scarlet (not med.) per 10 gr.. 



X Water Blue per 10 gr.. 



.50 

 .50 

 .60 

 .75 

 .70 

 .50 

 .65 

 .65 



LIQUID STAINS can also be furnished. 



PRICES UPON REQUEST 



9-11 East 16th Street 



LENZ APPARATUS COMPANY, Inc. 



EVERYTHING FOR THE LABORATORY 



NEW YORK, N. Y. 



