6i8 Journal of Agricultural Research voi. xv, no. n 



The holder is then passed to an assistant who removes the used pipettes 

 which are placed in water to prevent drying of the serum, after which 

 fresh pipettes are inserted and equalized by slight pressure on a flat level 

 surface. The use of four metal holders insures always a clean set of 

 pipettes ready for use by the operator. 



On completion of the removal of serums, the pipettes are subjected to a 

 thorough washing, drying, and sterilization in hot air for two hours. 



Actual tests showed that i,ooo specimens. can be removed conveniently 

 from the bottles and placed in test tubes in about one-half hour. 



The following advantages are claimed for the holder : 



(i) No eyestrain attends the operation of the device, 



(2) The pipettes are sufficiently small to enter the bottles without 

 agitation of the contents. 



(3) Only one operator and two assistants are required, where pre- 

 viously many were necessary. 



(4) Only a short time is needed for one operator to remove specimens 

 of a great number of serum samples. 



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