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NEW WORK JUST READY

Dental Histology andComparative Dental

AnatomyBy RUDOLFKKRONFELi, B.S., M.D., D.D.S.

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VOL. 86, No. 2226

is snipped off and immediately inserted into a test-tube containing a saturated solution of sodium citrateand then dried by gentle wiping with clean gauze.The blood drips freely from the wound and no clottingoccurs in the pipettes or on the slides. If a numberof counts or blood :films are to be made from the sameanimal the end of the tail may from time to time bewiped with gauze very slightly moistened with thesodium citrate solution.

This method is time-saving and satisfactory in everyway. The only necessary caution is not to have thesite of puncture or wound too wet, as an excess ofsodium citrate will cause the cells to crenate andmight also interfere with the vital staining. This,however, is easily avoided by leaving the skin of theanimal only slightly moist.

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202 SCIENCE

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AUGUST 27, 1937 SCIENCE-ADVERTISEMENTS 5