A potometer measures how factors such as light, temperature, humidity, light intensity and wind will affect the rate of transpiration. The main type of potometer is the 'bubble' potometer shown in Figure Figure 6.
Physicians recommended against the practice because they did not want medicines associated with punishment. A heavy dose of castor oil could be used as a humiliating punishment for adults, especially political dissenters. Colonial officials used it in the British Raj (India) to deal with recalcitrant servants. Belgian military officials prescribed heavy doses of castor oil in Belgian Congo as a punishment for being too sick to work.
Why? Castor oil, a very pale yellow liquid extracted from the castor seeds of Ricinus Communis, is one of the most useful plant oils. Castor oil comes in different grades and is used as food additives, in cosmetics, in flavorings, as a mold inhibitor and in pharmaceuticals.Castor oil has a long history of medicinal uses both internally and externally, treating conditions ranging from arthritis to genital warts.f youâre thinking of using castor oil to bring back the glory, hereâs how: Since castor oil can be thick, dilute it with lighter oil like sweet almond oil or avocado oil. Apply to scalp, rub it in gently and wrap your hair with a plastic cap or towel.