The same order of absorption and general directions pertaining to the use of Hempel pipettes have to be adopted.
Pipettes and burettes are graduated to deliver the quantities specified.
Burettes differ mainly from pipettes in having the flow of liquid controlled from below instead of from above.
Standard Babcock test bottles and pipettes should always be used.
Place the pipettes in a convenient receptacle, filled with water to which soap powder has been added.
Open the case containing the pipettes, grasp one by the plugged end, remove it from the case, and replace the lid of the latter.
Place the pipettes in a vertical position, in a beaker, in the incubator at 37°C., for one or two hours.
Place the box with the pipettes in the incubator and set the signal clock to ring at 15 minutes (or start the stop watch).
At the expiration of the incubation time remove the pipettes from the incubator.
While Nadia controlled her impatience as best she could, Stevens manipulated the bulbs and pipettes of the gas apparatus.