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叶脉书签用在植物课教学上,如双子叶植物的叶脉和单子叶植物的叶脉的比较,来观察网状叶脉的生长分布情况,是比应用刚从植物体上摘下的叶来观察清楚得多,另一方面,这种标本经染色后,扁薄美观,尝被用作有教育意味的书签,现在将我做过的叶脉书签的两种基本制法介绍如下:(1)煮制法(药剂法) ①材料树叶,碳酸钠(N_a2CO_3)5克,氢氧化钠(NaOH)7克,水200立方厘米,染料。②工具烧杯(250立方厘米),铁架,酒精灯(或火炉代),镊子,试管刷,量筒,天平,玻璃水槽。③制法首先采集叶脉粗壮、坚韧而密的树叶200片,利用实验室内的250立方厘米烧杯一只,盛入200立方厘米的清
Vein bookmark used in the teaching of plants, such as dicotyledonous leaf vein and monocotyledon leaf vein comparison, to observe the growth of reticulated veins distribution, than the application of fresh leaves from the plant to observe clearly On the other hand, the stained samples of this specimen are very thin and beautiful, and are used as educational bookmarks. Now I introduce the two basic methods of bookmarking veins that I have done: (1) Cooking (Pharmacy) ① material leaves, sodium carbonate (N_a2CO_3) 5 grams, sodium hydroxide (NaOH) 7 grams, 200 cubic centimeters of water, dye. ② tools beaker (250 cm3), iron frame, alcohol lamp (or stove), tweezers, test tube brush, measuring cylinder, balance, glass sink. ③ system of law first collected leaf thick, tough and dense leaves 200, the use of laboratory 250 cubic centimeter beaker, containing 200 cubic centimeters of clear