xiv LABORATORY RULES 



9. No cultures are to be taken out of the laboratory 

 without the permission of the head of the department. 



10. All accidents, such as spilling infected material 

 (pathogenic or non-pathogenic), cutting or pricking the 

 fingers, must be reported at once to the instructor in charge. 



Additional rules will be given if necessary, in conjunction 

 with special exercises or technic. 



11. 1-1000 mercuric chloride will not injure the skin if 

 not used too often. Wash your hands in it thoroughly each 

 time before you leave the laboratory to avoid carrying away 

 undesirable organisms. Use every precaution against in- 

 fection. 



12. At the beginning of each laboratory period read over 

 carefully the directions for the next exercise in order to 

 understand its purpose and to make any necessary pre- 

 liminary preparations. 



13. Take careful notes on all observations made in the 

 study of cultures and preparations made from them. 



