136 ROBERT CHAMBERS. 



the screws e, /, g and h, under the low and high powers of the 

 microscope. Finding the tip of the needle under high powers is 

 facilitated by using an ocular containing cross hairs. 



The coverslip with its drop containing the tissue to be dis- 

 sected is now inverted over the moist chamber. The cells to be 

 dissected are brought into the field of the microscope. The tip 

 of the needle is then raised by the screw c until brought into view 

 first under low and then under high power. The apparatus is 

 now ready for dissection. 



In conclusion I wish to suggest to the prospective worker in 

 this field that he use the utmost conservatism in his interpreta- 

 tions of observed effects produced in microdissection. One must 

 constantly keep in mind the extraordinary instability ot living 

 cell structures. 



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