50 THE MICROSCOPE. [April, 



not so handsome as some of the other styles. It has a strong thin 

 circular stage, to which can be added, when desired, the glass 

 stage ; a large double mirror capable of swinging above the stage, 

 saving the expense of a bull's-eye for opaque objects ; the new 

 dome diaphragm, better in some respects than the iris; and the 

 tube can be contracted to the short standard, allowing the use 

 of objectives corrected to that standard if desired. 



As to objectives, if the idea be still to get the best possible for 

 the least money, I would recommend those of Leitz, as they are 

 low in price and most excellent in quality and excel in those 

 qualities that beginners need — long working distance and re- 

 markablv clear definition. While not of extreme angular aperture, 

 the resolving power is good. I would advise the purchase of 

 Xo. 3. about 7-10 in., and Xo. 7, about ^ in. I should also sug- 

 gest a double nose-piece so that both objectives may be kept on 

 all the time while at work, as one will often neglect to use the 

 proper power if it must be screwed off and on each time. Xo one 

 accessory is of so much use as the double nose-piece. A camera 

 lucida will be needed, and as good a one as can be afforded, 

 though the common one at $1.50 will do good service. An eye- 

 piece micrometer will also be needed, and one can be fitted to 

 the evepiece at a cost of $1.50. I would advise the selection 

 of a B eyepiece and disc micrometer, if only one is to be pur- 

 chased. Of course A and C would be better, but it is surprising 

 how little use in real work there is for more than one eyepiece. 

 If one can possibly spare $5.00 more, I would advise that this 

 stand be fitted with the adjustable mirror bar. as it will be needed 

 when a condenser is purchased and is far more convenient for 

 everyday work. Of course I could name many more useful 

 accessories, but I adhere to the terms of the question and name 

 reallv efficient outfit for a low price. I would not advise 

 anv one to purchase a lower priced outfit who intended to do any- 

 thing more than play with the microscope. As to the second 

 question, I know of no more interesting line of work than micro- 

 scopical botany, and there is this advantage — that material can be 

 had anywhere for nothing. 



Outfit recommended : 



Model Stand and B eyepiece, $25.00 



Camera lucida, 1-5° 



Disc Eyepiece. l -5° 



Double nose-piece, 5-°° 



Leitz objectives : 



No- 3^ 6.75 



No - 7> 13-5° 



Total $53.25 



