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.
What is Jamaican Black Castor Oil? Jamaican black castor oil has been used for centuries as a natural remedy for a wide range of maladies, including skin problems and aches and pains. The dark nutrient-rich oil is obtained from pressing castor beans. The oil produced is commonly used as a hair treatment to repair damage and also to encourage hair growth.