RECORDS. 



Ill 



~f 



fermentation tnbes, since records made with these pencils will bear streaming steam. 

 An inexpensive black pencil which writes on clean glass ver)' readil)- and Isears 

 steam well (even better than Faber's) may be made by stirring into melted beeswax 

 enough lamp-black to make a thick-flowing liqnid (as thick as will flow). This is 



poured into molds made 1)\ wra])]nng writ- 

 ing paper, in seA'cral turns, around a lead 

 pencil or thick glass rod, t)'ing near one end, 

 removing the rod, squeezing the other end 

 flat, turning over its edge, and fastening this 

 flattened end in a split stick or clam]). The 

 paper should be retained as a c<)\-er, the string- 

 being renio\'ed and the loose edge pasted 

 down. A dozen such pencils uua\' be made 

 at a cost of lo cents. In the absence <.)f such 

 pencils, flasks and fermentati(.iu tubes may 

 be distinguished in the steamer In- dropjung 

 over the neck different-sized nd)ber bands or 

 different numbers of the same kind of band, 

 or by writing with a lead jieucil the number 

 of the stock on a square of letter i)aper, cut- 

 ting a hole in its center and slipping this 

 over the neck of the flask or tube. When 

 the steaming is over, the regidar lal^els should 

 p. „, ,,. be pasted on or the stock number written on 



with the proper pencil. 

 All plate cultures and all subcultures made on a given da\-, no matter of what 

 organism, are numbered serially, beginning with i. These are i, 2, 3, etc., of that 

 particular da}'. Those of an)- other day are also numbered i, 2, 3, etc. The writer 





\'ki^ /I. 'i^c^ 



■fK. •^. 



\5i»AJU2-y-2 /3-2- 



i'/ i' e 



.+110 /TIaA^.''^!^^ 



\3.>mil">A [7-'/ 





^i 



f>w%'^ CL/j-iCi JUfi-f. 



Fig. 97.* 



usually numbers liis plates I, II, III, etc. Labels maybe pasted on the covers of the 

 Petri dishes, or all may be done with the glass pencil. Cultures in tidies subject to 

 frequent handling and likely to be needed for some time should have gummed-paper 

 labels written in iuk. The above transcripts from labels on four test-tube cultures 



''Fig. go. — La1)cls fnnii ic^t-tube cultures. 



*Fii-,. 07. — A\'(H.(lcn lal)(--Is from inoculated plants. 



