80 CATALOGUE OF EXHIBITS. 



collection of Dr. Thomas Egleston, recently presented to the 

 Department. 



3. Erionite, Durkee, Oregon. A New Zeolite, described 



and exhibited by Arthur S. Eakle, of Harvard Univer- 

 sity. 



4. a. Photographs of Mineral Specimens Reduced or En- 



larged, " photomicrographs " with society size acces- 

 sories including lantern slides for lecture illustrations 

 and prints for book illustrations. Made by exhibitor. 



b. Apparatus for Projecting the Effects of the 

 Passage of Convergent Polarized Light, through 

 crystals practically after the plan given in Wright's 

 " Light " London. But being made of aluminium it 

 is so light that it is not disposed to sag, and requires 

 no supporting bed. Made by exhibitor. 



c. Rakestraws of Society Size, showing methods of 



mounting in special instances. 



1. Attwood cells in rakestraws. 



2. Cover glass cemented on ground surface of speci- 

 men. 



d. Accessories for Society Size Rakestraws. 



1. Modern Cartoon designed by Roy Hopping. 



2. Microscope stage attachment for holding Rake- 

 straws during examination, designed by James 

 Walker. Made by William T. Gregg. Exhib- 

 ited by Wallace Goold Levison. 



5. a. Large Quartz Twin from Japan. 



b. Green Fluorite from New Hampshire. 



c. Unaltered Crocidolite from South Africa. 



d. Uranium Minerals from Colorado. 



t\ Thomsonite and Analcite from Colorado. 

 /. Recent finds in the Iron Mines North of England. 

 g. Allophane from New Mexico. 

 h. Recent Finds near Joplin, Missouri. 

 Exhibited by Geo. L. English & Co. 



6. a. Neptunite, Narsasuk, Greenland. 



b. Epididymite, Narsasuk, Greenland. 



