CHAPTER III 

 Laboratory Manipulation 



22. Importance of Laboratory Practice. Laboratory 

 practice is an essential part of the study of chemistry. 

 Many of the important facts and laws of chemistry are 

 capable of being demonstrated by the student, and the 

 laboratory practice assists in developing more perfect 

 ideas in regard to the composition of substances. The 

 hand, the eye, the nose, and, to a less extent, the ear, 

 are all called into use in the laboratory, and this results 

 in a balanced education of the senses. Neatness is abso- 

 lutely necessary for success in laboratory work. An ex- 

 periment performed in a slovenly way, with dirty and 

 poorly connected apparatus, and poor mechanical manip- 

 ulation, fails to give the right impression or results. 



When laboratory work is in progress it should receive 

 the student's entire attention. The directions for the 

 experiments should be carefully followed. The appara- 

 tus should always be put together as directed, and be- 

 cause of the danger of accident, the student should never 

 take the risk of connecting apparatus in an original way, 

 or of using for the experiment, materials other than those 

 directed. The student should never attempt to experi- 

 ment for himself in combining chemicals. 



23. Names and Uses of Apparatus. The various 

 pieces of apparatus used in the experiments are shown in 

 Plates I and II. Number 23 shows the common Bunsen 

 burner, and at the right, the wing-top attachment, used 



