420 



A HUMAN EMBRYO OF THE PRESOMITE PERIOD. 



ual specimens is arrived at by their adjustment to the maximum- and minimum-age 

 data, as indicated by the heavy brackets. The ages fall within these limits and thus 

 form a curve which would correspond to the gradual increase in size and the differ- 



Branched 



Days previous to 

 termination of preqnancy 



Miller 



Bryce -Teacher 



ILinzenmeier 

 Peters 



Fetzer 

 Jung 

 Merttens 

 Strahl-Beneke 



v. Spee, v H. 



MATEER 



Giacomini 



Reichert 



!' , ' 



Grosser 

 Frassi 

 Eternod 

 v. Spee, Die. 



CHART 3. In \\nr- chart arc shown the clinical data of the human embryos of the presomite period, 

 arranged from above downward in the order of their development. Brackets are in- 

 troduced in those cases having crucial age-data, and the ages for the different stages 

 of development must fall within the bracketed periods. In this way the probable age 

 of each specimen was determined, and this is indicated by heavy horizontal lines. 



entiation of the individual specimens. The essential clinical facts as far as reported 

 are indicated in the chart and need not be detailed here. It should be said, however, 

 that in the cases terminating in abortion 24 hours are allowed as an average dura- 



