ZOOLOGY AND EOT AN Y, MICROSCOPY, ETC. 



415 



The body-tube is graduated and the focal distance is read by means 

 of a vernier on the limb ; the milled head of the fine adjustment r is 

 divided ; the rectangular movements of the mechanical stao-e are also 

 each provided with a scale and vernier, while the margin of the stacfe 

 is graduated and has two fixed verniers. 



There is a spring clip for rapidly attaching the objectives. 



A special form of goniometer (figs. 61 and 62) is adapted to the 

 stage, for measuring the distance apart of the optic axes in air or in 

 oil or other liquids. The object is held in forceps attached to a 



Fig. 61. 



Fig. 62. 



spindle connected with the smaller of the two milled heads. This 

 rotates independently for adjusting the object or can be withdrawn if 

 required. When the adjustment has been made the rotation of the 

 larger milled head, to which a vernier index is attached, carries with 

 it the inner spindle and forceps, and the extent of the inclination thus 

 given to the object is measured by the index on the graduated semi- 

 circle G. The circular box C holds the liquid, and has an aperture 

 at the bottom closed with a glass plate admitting light from the 

 mirror. 



Fase's Portable Binocular Dissecting and Mounting Micro- 

 scope.* — The Rev. H. J. Fase describes an arrangement by which 

 all the things required for dissecting and mounting, as well as a 

 binocular for observing, can be carried in a compact form, and com- 

 prising: — 



I. A full-sized, steady dissecting stage, with sloping rests for the 

 hands. Two pairs scissors, knives, two pairs forceps, watch-glass, 

 needle-points, &c. 



II. An arm so constructed that it will carry a large low-power 

 lens for dissecting. A ring, into which various objectives can be 

 dropped for the same purpose, and a binocular body, which can be 

 easily substituted for the ring, and allows of the manner in which the 

 dissection is progressing to be inspected, and also steady enough to 

 make an efficient binocular for ordinary observation. 



III. Places in the case for a small number of cements, and media 

 most usually required by working microscopists. Brushes, dipping 

 tubes, lamp clips, slides, glass circles, troughs, a hot plate, and tui-n- 



* Jouru. Quek. Micr. Club, i. (1883) pp. 109-11. 



