

1 i\ 



slides <1 reference number of each 



men. Thus labelled ihe *lide may be put away for 

 future study and comparison. 



inrocess seems perhapt a 1 ious. 



%o mechanical that after the 

 mode of i ia* been learnt by a little 



ricnce, the nibbing down may be done while the operator 

 b read . 1 hus in the evening, when enjoying a plea- 

 sant book after his day in the field, he may at the same 



rub down his rock<hipt, and thus get over the 

 drudgery of the operation almost uncomciou 



grooved sides for carrying microscopic 

 slides are sold in different sixes. Su< h Ixwes are most 

 convenient for field-work, as they go into small space, 

 and with the help of a little vool they hold the 



glass-slides firmly without risk of breakage. Cheap card- 

 board trays for the same purpose are mad< 

 land, 38 West Smithtield, London, and also at Kdinburgh, 

 For a final resting-place, a case with shallow trays or 

 drawers in which the slides can lie flat is most convt 

 One final remark may here be required. The learner 



not suppose that having prepared his slices, he has 

 nothing to do but to place them under the microscope 

 and at once determine their compose will find 



it by no means an easy task to make satisfactory progress, 

 and at first he may be inclined to abandon microscopic 

 work in despair of ever gaining confidence in it. 

 him, htm-i ver, begin by studying individual minerals, and 

 make himself acquainted gradually with their various 

 characters. He should prepare, after the manner de- 

 scribe --27, a series of slides of the minerals which 



