196 LABELING AND CATALOGING \_CH. VII 



If one has a writing diamond it is a good plan to write a label with it on one 

 end of the slide. It is best to have the paper label also, as it can be more easily 

 read. 



FIG. 164. Writing diamond for writing numbers and labels on glass slides, 

 cutting cover-glasses, etc. ( Queen and Co. ) 



The author has found stiff cards, 12^ xy^ cm., like those used for cataloging 

 books in public libraries, the most desirable form of catalog. A specimen that is 

 for any cause discarded has its catalog card destroyed. New cards may then be 

 added in alphabetical order as the preparations are made. In fact a catalog on 

 cards has all the flexibility and advantages of the slip system of notes (see Wilder 

 & Gage, p. 45). 



Some workers prefer a book catalog. Very excellent book catalogs have been 

 devised by Ailing and by Ward (Jour. Roy. Micr. Soc., 1887, pp. 173, 348 ; Amer. 

 Monthly Micr. Jour., 1890, p. 91 ; Amer. Micr. Soc. Proc., 1887, p. 233). 



The fourth division has been added as there is coming to be a strong 

 belief, practically amounting to a certainty, that there is a different structural 

 appearance in many if not all of the tissue elements depending upon the age of 

 the animal, upon its condition of rest or fatigue ; and for the cells of the digestive 

 organs, whether the animal is fasting or full fed. Indeed as physiological histology 

 is recognized as the only true histology, there will be an effort to determine exact 

 data concerning the animal from which the tissues are derived. (See Minot, Proc. 

 Amer. Assoc. Adv. Science, 1890, pp. 271-289 ; Hodge, on nerve cells in rest and 

 fatigue, Jour. Morph., vol. VII. (1892), pp. 95-168; Jour. Physiol., vol. XVII., 

 pp. 129-134; Gage, The processes of life revealed by the microscope ; a plea for 

 physiological histology, Proc. Amer. Micr. Soc., vol. XVII. (1895), pp. 3-29; 

 Science, vol. II., Aug. 23, 1895, pp. 209-218. 



CABINET FOR MICROSCOPICAL, PREPARATIONS 



311. While it is desirable that microscopical preparations should be pro- 

 perly labeled and cataloged, it is equally important that they should be protected 

 from injury. During the last few years several forms of cabinets or slide holders 

 have been devised. Some are very cheap and convenient where one has but a few 

 slides. For a laboratory or for a private collection where the slides are numerous 

 the following characters seem to the writer essential : 



( i ). The cabinet should allow the slides to lie flat, and exclude dust and light. 



(2). Each slide or pair of slides should be in a separate compartment. At 

 each end of the compartment should be a groove or bevel, so that upon depressing 

 either end of the slide the other may be easily grasped (Fig. 165). It is also 

 desirable to have the floor of the compartment grooved so that the slide rests only 

 on two edges, thus preventing soiling the slide opposite the object. 



(3). Each compartment or each space sufficient to contain one slide of the 

 standard size should be numbered, preferably at each end. If the compartments 

 are made of sufficient width to receive two slides, then the double slides so fre- 

 quently used in mounting serial sections may be put into the cabinet in any place 

 desired. 



