. Contributions from the Botanical Laboratory, vol. 11. Botany; Botany. 418 THE SCIENCE OF RADIOLOGY THE GURWITSCH RAYS 419 diaphragms, which are between the photo-cells and the cultures. The differ- ence in adjustment of the two diaphragms, and therefore in light-intensity of the two cultures, is determined from the vernier readings. The two ves- sels containing the cultures may be rotated, and rebalanced, thus checking one photo-cell against the other. The criticism, whether justified or not, that one cannot count and compare with precision the number of dividing cells in a tissue, or buddin
. Contributions from the Botanical Laboratory, vol. 11. Botany; Botany. 418 THE SCIENCE OF RADIOLOGY THE GURWITSCH RAYS 419 diaphragms, which are between the photo-cells and the cultures. The differ- ence in adjustment of the two diaphragms, and therefore in light-intensity of the two cultures, is determined from the vernier readings. The two ves- sels containing the cultures may be rotated, and rebalanced, thus checking one photo-cell against the other. The criticism, whether justified or not, that one cannot count and compare with precision the number of dividing cells in a tissue, or budding ones in a culture, is met by these indirect methods of measuring which wholly elimi- nate the personal element. Also, whatever objection there may be to the mathematical handling of the results, is eliminated as a sweeping criticism TO VACUUM PUMP AND GAS PREbbURC CONTROL. QUARTZ RtCEPTACLL FOR MITOOENCTIC RAWATOR SPEAKER AND TAPE RECORDER TRANbWVRENT CXJARTZ WINCIOV5 CONDENSING COLLECTOR 5URFACE. PHOTOCLECTRIC ACTIVE SURfACE TO ACCELERATING POTENTIAL. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original University of Pennsylvania. Botanical Laboratory; University of Pennsylvania. Morris Arboretum. Philadelphia : [s. n. ]
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