1, dried specimens of plant wax leaf specimens should be kept in a sealed and dry wax leaf specimen cabinet. Because new specimens are often parasitized by pests and eggs, it is best to disinfect them with drugs when entering the cabinet. It is about 0 with carbon disulfide. 5KG in a container, put it in a box (1. 7 square meters), unpacking after two days, so that the toxic gas can be removed and the specimen can be taken out. Carbon disulfide gas is heavier than oxygen in the air. Drugs should be placed on the specimen. Or put a specimen that is not on the paper into 0. Soak in 5% mercuric chloride alcohol (75% for industrial use) solution once, and put it in the cupboard after preparation. Mercury (mercuric chloride) is toxic and cannot react chemically with metals. Don't use metal instruments. Wear rubber gloves when using and wash your hands with soap afterwards. Specimens with what medicine to kill insects, to indicate on the surface paper, in case of poisoning. Cinnamomum camphora essence should be placed in the wax leaf specimen cabinet to prevent pests. Classified specimens should be classified for easy use. The dried specimens of roots, stems, flowers and fruits of plants can be arranged in the order of textbooks. Taxonomic specimens are arranged according to the classification system and families. At present, the classification systems commonly used in herbarium are AENGLER and Cronkite. CRONGUIST) and other classification systems. There should be a branch catalogue on the cupboard door and a branch label in the cupboard for easy searching. Maintenance If the leaves in the specimen fall off, you can apply glue (plant glue) on the back of the leaves with a brush, stick them in a natural posture, and dry them in the shade. The broken branches should be pasted with vinyl acetate glue, and then with adhesive tape. Moldy and moth-eaten specimens are washed with a brush dipped in 95% alcohol or 10% formalin solution, and dried with a brush to remove mildew spots. Damaged table paper and cover paper should be replaced with new ones. Move the sample gently and don't turn it upside down. Put the specimen in the cupboard, not too crowded. When borrowing specimens, be sure to fill in paper packaging and pay attention to moisture protection. Plant seed specimens should choose typical new seeds without pests and diseases, remove impurities, dry them in the sun, put them in seed bottles, label them, and check them frequently to prevent mildew and pests. Insect specimens and boxed specimens such as pests and diseases, the abdomen and soft parts of large insects and dry larvae are prone to mildew. Ampoules in boxed specimens of insect life history, pests and diseases are easy to be damaged and the labels fall off, so the damaged parts can be replaced at℃. The damaged parts of plants can be repaired according to the method of repairing wax leaf specimens. Insect-proof and moisture-proof drugs such as camphor and silica gel should be put in the boxed specimens. Other fossil specimens should be protected from vibration and collision. When damaged, it should be filled with gypsum and bonded with polyvinyl acetate glue (milky white glue). The eggshell of the bird egg specimen is damaged, so it can be removed and pasted into pieces. The dry specimen of circulatory system is filled with celluloid, which is fragile and shockproof. If it is damaged, it can be bonded with a brush dipped in acetone. Submerged specimens and materials Submerged specimens and experimental materials shall be labeled, pasted firmly, waxed, and stored stably in the biological cabinet according to the number. Specimen bottles should not be shaken to avoid being broken, nor should they be placed in direct sunlight, high temperature or below 0℃ to prevent the sealing wax from melting and the glass bottles from freezing and cracking. Plant experimental materials can also be soaked without chemicals. Put some cotton wool soaked in 20% formalin at the bottom of the specimen bottle, cover it with white paper, and then seal the material. You can put a small amount of 20% formalin in plastic bags for a long time, then put the experimental materials in and tie the bags tightly. It can also be preserved for a long time. It is necessary to use the registration book to record the date of manufacture of each bottle of specimen and the formula of the liquid medicine, and according to the mark, it is convenient for later examination and treatment. Primary color specimens should be placed in a biological cabinet with a door to prevent fading due to sunlight. When the solution turns yellow and turbid and the specimen is exposed to the liquid level, it is necessary to replace and supplement the new solution (add 10% formalin, etc. ) in time. If the preserved experimental materials are going to deteriorate, the concentration of the preservation solution can be increased. Soaking transparent specimens will produce many bubbles, which can be extracted by syringe. If the font size on the specimen falls off, it can be dried with cotton wool and pasted with gelatin solution (gelatin gram, soaked in 50 ml of water for one day, then heated and dissolved in water). If the glass plate containing the specimen is broken, cut the glass with a diamond knife, smooth the four sides with a grinding wheel, re-fix it and put it in. Adding and replacing the solution and sealing the bottle should be done in summer, because the bottle cap is easy to open in summer. Turn the glass ball on the lid and pull out the bottle cap. You can also use the tip of a knife to remove the sealing wax and open the bottle. Stripped specimens Stripped specimens should be placed in biological cabinets according to numbers, and oversized ones should be placed in self-made glass cabinets, which should be moisture-proof, anti-corrosive, dustproof, insect-proof and rat-proof. Silica gel or quicklime (wrapped in two layers of gauze) is used as desiccant in the cabinet, and camphor preparation is used to repel insects and prevent mold (wrapped in gauze). Stripped specimens should not be exposed for a long time, and the area is gray on the cabinet. Don't put the freshly peeled wet specimen in the biological cabinet. You can kill pests with fumigant. In spring, put the specimen in a disinfection box, put a plate in the box, put a bowl on it, put sulfur in the bowl, put iron bars on the bowl, light the sulfur and cover it. After two days, the box cover was opened, and the specimens were taken out and put into the biological cabinet for preservation. If vertebrate specimens are damaged, animals with similar species, sexes and sizes should be selected, the damaged parts should be cut off, fixed with pins, coated with 40% formalin solution for anticorrosion, and dried as repair materials. Plastic painting after repair. Such as fin, reptile phalanges, etc. , can be cut into two inclined planes and glued with polyvinyl acetate. The defects of large mammals can be filled with putty, then the hair of armpit and abdomen is pulled out and glued to the putty with polyvinyl acetate. Bone specimens Bone specimens should avoid vibration and scattering and be covered with a back cover. Degumming due to moisture makes the joint easy to fall off. The sun will turn yellow and discolor for a long time. When the bone breaks or falls off, it can be pasted with polyvinyl acetate (fixed with thread). Slice specimens Slice specimens should be numbered and placed in a wooden box with special slices. Many grooves are carved on both sides of the box, and both sides of the slide are inserted along the grooves to make the slide stand upright in the box. Each box can hold 50~ 100 tablets. The box should be put straight to keep the sample level. There should be a catalogue of the number and name of each specimen in the box, which is convenient to find and use. Wooden cases should be kept in a dry place to avoid sunlight. Slices can also be stored in slide racks (grids).