234 



BENJ. PIKE S, JR., DESCRIPTIVE CATALOGUE. 



so much as when more light is thrown on in the way just 

 described. This lens serves also to magnify any large flower, 

 or other object. Price, $20.00. 



Fig. 753. Culpepper Microscope. (Fig. 753.) 



This instrument is one of convenient 

 form, possesses considerable power, 

 and was at one time almost the only 

 one sought after. It is shown in 

 the cut as set out for use ; it stands 

 twelve or fourteen inches high, and 

 has four or six different powers. A, 

 is the slide-head, turned concave; 

 B, the eye tube, containing two pow- 

 erful lenses; c, the slide tube by 

 which the instrument is adjusted; 

 D, the body in which the upper part 

 slides, having in some cases a rack 

 and pinion movement at K ; E, is a 

 circular brass table, supported upon 

 three legs, which are screwed upon 

 the stand, F. In the middle of E is 

 a spring object holder ; G, the mir- 

 ror which reflects the light through 

 the object to the eye ; H, an illu- 

 minator or lens, for reflecting light 



upon opaque objects ; i, is a contrivance called the frog 



plate ; and J is the nippers and needle. 



Price, $15.00 to $25.00. 



Gould's Improved Pocket Compound Microscope. (Fig. 

 754, next page. The extreme portability and great magni- 

 ing power of this microscope will recommend it strongly to 

 the naturalist, mineralogist, and botanist, as it has sufficient 

 powers to discover minute animalcules and seed-vessels. It 

 combines the uses of the single, compound, opaque, and 

 aquatic microscopes ; and has been found, upon comparison, 

 by several scientific gentlemen, superior in power to, and 

 more distinct, than many of the larger and more expensive 

 instruments of the kind. It shuts up in a case, three inches 

 by three and a half, and may be carried in the pocket with- 

 out the slightest inconvenience. 



