WORKING ARRANGEMENTS. 7 



dry by touching with blotting paper, and complete the cleansing with 

 wash leather. If oils or balsam are to be removed, dissolve with a 

 little alcohol or benzene and dry. 



Avoid lubricating the coarse adjustment, but rub it clean with a 

 duster. If the fine adjustment works stiffly cleanse the screw of dust, 

 then remove old oil with benzene and touch with a little watchmaker's oil. 



Appangement of the work table. Place all that is likely to 

 be required read}- to your hand. The microscope should stand at 

 a convenient distance from the edge of the table and directly in 

 front of the observer. Its body should be inclined whenever the 

 nature of the work will allow, so as to avoid stooping the head 

 more than is necessary. Keep the drawing book to the right of the 

 microscope. The case for specimens, and a tray holding slides, covers, 

 labels &c., are placed together, at the further edge of the table. 

 This will leave the remainder clear as working space. 



In the histological laboratory of the Yorkshire College the space 

 allotted to each worker is 2 ft. 6 in. square, and between every two 

 places are a porcelain sink, water tap (low pressure, to avoid 

 splashing) and electric light (16 c.p.), available within 18 in. of the 

 microscope, and shaded, so as to prevent direct illumination of the 

 worker's eyes. Each student has also a pedestal locker. 



To clean slides and cover-glasses. Wash them in soap and water 

 or benzene to remove grease or balsam. Dry with a thin glass cloth. Thin 

 covers, if ver} 7 dirty, are placed in strong sulphuric acid, washed in water, 

 and drained on blotting paper before wiping ; the latter is accomplished 

 either in the fold of a thin towel between the thumb and forefinger of one 

 hand, by gently moving them upon each other, or between two flat pieces 

 of wood tightly covered with wash leather. A stock of slides and covers, 

 ready cleaned and protected from dust, should be kept in readiness. 



Labelling* preparations. Label without delay and write in ink. 

 Use two labels, one at each end of the slide. One should bear the 

 serial number and class designation or special point illustrated, written 

 as large as the space will allow for ease of reference, and the name of 

 the owner. The other should give information as to origin, method 

 of preparation, the nature of the stain, the nature of the mounting 

 fluid, if necessary, and the date. 



Finishing off. All preparations should be laid flat. Those mounted 

 in balxam until hardened. Air spaces, which may arise in the course 

 of drying, should be filled up with balsam. Any very obtrusive 

 balsam may be scraped off with a knife, and the slide cleaned with 

 a rag moistened with benzene. They should not be ringed. Specimens 



