PHYSICAL STATE OF PROTOPLASM
Several theories have been given about its physical structure -
(i) Granular Theory (Proposed by Altman, Hanstein, 1886) - Granules embedded in a fluid, those are known as bioplast/cytoplast. Henle & Megi used the word plastidules for granules
(ii) Reticular Theory (Proposed by Fromman, Klein, Carnoy, 1885) - Reticulum of fibres embedded in a fluid.
(iii) Fibrillar Theory (Proposed by Velton & Flemming, 1882) - Fibrils dispersed in a liquid.
(iv) Alveolar Theory (Proposed by Butschli 1878) - Droplets or alveoli is present in it.
(v) Crystallo-Colloidal Theory (Proposed by Fischer, Hardy Wilson 1894) - Substances dissolved and dispersed in water forming both true solution as well as colloidal solution.