258 



THE AMERICAN MONTHLY 



[Sept., 



devise to suit his instrument. If you have a "sta»e ring" to 

 your microscope, an attachment can easily be made, by having 

 a wooden spool or ring turned to slip into the stage ring easily, 

 with a hole in the centre of the wooden ring large enough to 

 hold the polarizer. Around the outside of this wooden ring, 

 glue a piece of silk to prevent it from falling out of the stage 

 ring, but it must be capable of being turned. The illustrations 

 rejtresent one that I have made, which works nicely and it cost 

 me only about 75 cents. 



For the outside tube of mv polarizer, I utilized a No. 12 

 gauge paper shot shell, using the bottom i)art by cutting a hole 

 through the brass end. This leaves a rim on the end to take 

 hold of to turn the polarizer. 



Fi 



EXI'LANATIOiN OK THK FKiURES. 



The analizer complete ; it goes into tlie draw tube of 

 the microscope. 

 Fig. 2. The polarizer. 



Fig. 3. The diagonally cut paper tube. A, is the outer tube. 

 B is the inner tube. C, the cover glasses. D, the wooden ring. 

 E, the velvet or silk lining. 



The polariscope above described, although not as desirable as 

 one provided with a pair of Nicol prisms, is nevertheless worth 

 having and will give its possessor a great deil of satisfaction. 



California College of Pharmacy. — The Department of 

 Microscopy in the California College of Pharmacy at San Fran- 

 cisco is in charge of Prof. J. J. B. Argenti. The important vege- 

 table drugs are studied with the microscoi)e. All students are 

 instructed in mounting and preparing specimens and making 

 and mounting of sections as well as in drawing with the camera 

 lucida. The vegetable cell, its structure and contents structure 

 of roots, leaves, stems, seeds, etc., are all shown and explained* 

 Photo-micrography is also taught. 



