128 



Journal of Applied Microscopy. 



ss 



'eWi 



f M' 



Fig. 11. The marker consists of the part 

 SS with the milled edge (M). This part 

 bears the Society or objective screw for 

 attaching the marker to the microscope. 

 R. Rotating part of the marker. This bears 

 the eccentric brush (B) at its lower end. 

 This brush is on a wire (W). This wire is 

 eccentric, and may be made more or less 

 so by bending the wire. The central dotted 

 line coincides with the axis of the micro- 

 scope. The revolving part is connected 

 with the "Society Screw" by the small 

 screw (S). 



Section of a series marked to indicate 

 that this section shows something espe- 

 cially well. The lines of a micrometer are 

 ringed to facilitate finding the lines. 



For much of the work of histology 

 and embryology, small wide-mouth shell 

 vials are very convenient. Three sizes 

 have answered most purposes, 18x50 

 mm., 23x65mm., and 35x90 mm. The lips 

 should be slightly flared. The cost is 

 $2.00 per gross for the smaller ones and 

 $6.00 per gross for the largest ones. 

 These are not good for long storage. 

 They are for preparing objects. For long 

 storage nothing is so satisfactory as a 

 glass stoppered bottle. The larger of 

 these vials takes a slide and is very use- 

 ful for staining, clearing, etc. 



For reagents which are to be used with 

 a dropper or pipette, bottles of various 

 sizes are employed. That volatile li- 

 quids shall not evaporate, a cork is 

 perforated and put over the glass tube 

 as shown in the figure. 



Fig. 12. Shell vials. 



Fig. 13. Reagent bottle with combined 

 cork and pipette. 



For preparing objects a waste bowl or 

 dish with a rack on the top for sup- 

 porting the slides, a drainage funnel, 

 etc., is very convenient. One may use an 

 ordinary bowl or preferably an aquar- 

 ium jar. (Fig. 3). The rack is made of 

 two pieces of sheet lead into which are 

 soldered brass rods. The funnel is made 

 of brass or copper. 



For balsam, and homogeneous oil, no 

 receptacle has been satisfactory for 

 daily use except a capped bottle like a 

 small spirit lamp. Fig. 15. 



A moist chamber for b-lood prepara- 

 tions, etc., can be very simply made 

 with a bowl or an equarium jar and a 

 white dinner plate. 



