□ It is so small that it is not visible to the naked eye. □ The Cell is the smallest living unit of life. Fontana discovered nucleolus in the skin cell of Eel. In 1831, Robert Brown discovered the presence of nucleus in the cells of orchid root. Lamarck remarked that “no living being can have life if its constituent parts are not formed by cells”.Ĥ. Leeuwenhoek (1674) observed few living cells capable of moving, such as bacteria, protozoa,spermatozoa and red blood corpuscles under his own designed microscope.ģ. Cells were observed prior to Hooke by Malpighi (1661), who called them saccules and utricles.Ģ. His work was published in his book “Micrographia”. He examined thin slices of cork under his microscope and observed the honey comb like structures composed of box like compartments which were termed as the cellulae (cells). The first compound microscope was made by Robert Hooke (1665). The simple microscope was built by Zacharias Janssen and was modified by Galileo. Under a compound microscope, he observed many small compartments resembling a honeycomb. It is the smallest living entity found in living organisms.The term cell was introduced by Robert Hooke in 1665,while examining a slice of cork through his microscope.Cork is obtained from the bark of a tree. The Cell is the structural and functional unit of life. You will find a similar pattern and structure in each slide.Īll living organisms are made up of cells. You will observe a number of rectangular chambers under the microscope (as shown in the given figure). Place a cover slip on the material in such a way that no bubbles are formed. Add one-two drops of iodine solution on the material to stain the cell for visualization. Carefully transfer each layer on a clean glass slide using a paint brush. Then, place individual layers in a watch glass containing water. Peel off the skin from its inner side using forceps.
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