MICROANALYTICAL AND BACTERIOLOGICAL LABORATORY 423 



and every one distinctly labelled. Containers with liquids generally, and 

 oils, should not be placed horizontally, but vertically, and the sealing 

 must be perfect, for reasons which are self-evident. The samples must 

 be representative and in many instances they must be reduced and com- 

 minuted so as to get them into the containers. A few samples may re- 

 quire the use of wide-mouthed containers, such as the ounce quinine vials. 

 Not more of these should be used than is absolutely necessary, as they 

 take up too much space. Many of the articles may be filed away in book 

 form, or pasted in book form, or placed in small envelopes which in turn 

 are pasted in blank books which are equal in size and form to the other 

 sample books. The substances to be placed in the cabinet may be grouped 

 as follows: 



a. For the containers which are horizontally placed; solids and powders 

 of all kinds, broken, cut and trimmed substances. Gums, resins, waxes, 

 some pastes and other semisolids. Solid chemicals, most metals, etc. 



b. For the containers which are to be placed vertically; liquids gener- 

 ally, oils, syrups, chemicals in solution, etc. 



c. For the books all of uniform size; papers of all kinds, cloth of all 

 kinds, cordage, animal hair, samples of furs, vegetable fiber generally, etc. 



These physical groups may be made to include foods of all kinds ex- 

 cepting those which it is not necessary or desirable to keep on hand, drugs, 

 poisons, narcotics, cloth, silks, metals, minerals, etc. It is impracticable 

 and usually wholly unnecessary to preserve the readily perishable articles, 

 such as fresh meats, fresh vegetables, cheese, bread and pastries. All 

 materials in the cabinet must be non-decomposable, either naturally so 

 or rendered so through the addition of some suitable preservative. Some 

 food substances may be artificially desiccated before placing them into 

 the k containers. 



The sample books are to be placed in the bottom drawer of the cabinet, 

 in suitable compartments, and may include the following: 



(a) Books of samples of commercial papeis (book paper, note paper, 

 writing paper, etc.) 



(b) Books of wrapping paper, tissue paper, newspaper, etc. 



(c) Book of felt papers of all kinds, 

 (rf) Book of filter papers of all kinds. 

 (e) Books of cloth of all kinds. 



(/) Books of cordage, threads, twines, etc. 



(g) Book of parchments, bank notes, paper currency, etc. 



(h) Book of samples of furs of all kinds. 



(i) Book of silk samples, natural as well as artificial. 



(/) Book of miscellaneous fiber and cloth material, etc. 



Most of the books mentioned may be obtained from the special dealers 



