72 T. H. MORGAN. 



lower end of the paper simply dipped into water. Under these 

 conditions the eggs developed normally and young tadpoles ap- 

 peared. The eggs may have absorbed enough water from the 

 filter paper for their normal development. In later experiments, 

 the eggs, freed from their outer mem branes, were placed on dry 

 pieces of filter paper, six to eight on each small piece. The 

 water adhering to the inner membranes made a small damp spot 

 around each egg. The pieces of paper were then put into glasses 

 with covers to prevent further drying. In the course of a few 

 hours the eggs became flattened on the side in contact with the 

 paper. The segmentation continued under these conditions, and 



6 



FIGS. 1-6. Eggs developing out of water. 



in a few cases, noticeably those where too much water had been 

 left, normal or abnormal embryos developed. In the majority 

 of cases, however, the egg died, or the development was retarded 



