268 



TllK A.MKUirAN MONTHLY 



[Sevt., 



devise to suit his instrunu'iit. If yi>n have :i "sta;jje i'in<jj" to 

 your niierosoope, an att-iU'lmu'iit can rasily In- iii;ule, by having 

 a wooden spool or rinjj 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 pieee of silk to ]>revent it from falling out of the stage 

 ring, hut it must he capahle ff hi'ing turned. The illustrations 

 represent one that I liave made, whirh works nicely and it cost 

 me only about 75 cents. 



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

 gauge paper shot shell, using the bottom part by cutting a hole 

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

 hold of to turn the polarizer. 



KXPLA.NATlO.N OV THK KKiUKES. 



Fig. 1. The analizer complete ; it goes into the 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 polariscojje above described, althougli not as desirable as 

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

 having and will give its possessor a great de d of satisfaction. 



California College of Pharmacy. — The De|)artment of 

 Microscopy in the California (.'ollege of Pharmacy at 8an Fran- 

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

 table drugs are studied with the microscope. All students are 

 instructed in mounting and prej)aring 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. 



