ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



379 



MICROSCOPY. 



A. Instruments, Accessories, &c* 



CI) Stands. 



Portable Field Microscope. — This portable Field Microscope (fig. 86), 

 which was exhibited before the Society at its meeting on March 21st, 

 (see p. 270) by Mr. Ernest Barker, was first made some twenty-five years 

 ago, by Mr. Henry Anderson, who was for many years with the late 

 Mr. Andrew Ross. This Microscope has been in Messrs. Newton's cata- 

 logue for many years, they having kindly lent us this illustration. 



The Portable Field Microscope is specially designed and adapted 

 for botanical and seaside work, as it can be brought into instant opera- 

 tion without any unpacking or screwing together. It is fitted with eye- 

 piece, achromatic dividing object-glass, live cage, tweezers, and glass 

 dipping-tube, and goes into a mahogany case 4J in. by 1^ in. by 2 in. 



Swift's New Student's Microscope. — Fig. 87 represents the new 

 pattern Microscope exhibited by Mr. Swift at the Meeting of the Society 

 on March 21st, fitted with the Campbell differential-screw fine adjustment 

 (see p. 271). 



Swift's New Portable Microscope. — This is seen set up in fig. 88. 

 It will be noticed that a very low power can be used, owing to the great 

 range of focus allowed by the rack-and-pinion and draw-tube. It is 

 fitted with a substage condenser having an iris diaphragm and a push- 

 tube focussing adjustment. The back leg is looped, so that when it is 

 folded up to pack in its case, as in fig. 89, the limb with the head of the 

 fine adjustment screw passes into this loop. This forms not only an 

 efficient portable sea- or pond-side Microscope, but also one well adapted 

 for bed-side diagnosis. (See p. 406.) 



* This subdivision contains (1) Stands; (2) Eye-pieces and Objectives; (3) Illu- 

 minating and other Apparatus; (4) Photomicrography; (5) Microscopical Optics 

 and Manipulation ; (6) Miscellaneous. 



