A HISTORY OF SCIENCE 



till one o'clock of a day which is perhaps not devoted 

 to class-room exercises in any other school of Christen- 

 dom whatever namely, the Sabbath. It is interest- 

 ing to reflect what would be the comment on such a 

 procedure in London, for example, where the under- 

 ground railway trains even must stop running during 

 the hours of morning service. But Jena is not Lon- 

 don, and, as Professor Haeckel says, "In Jena one is 

 free. It pleases us to have our Sabbath service in our 

 tabernacle of science." 



All questions of time aside, it is a favored body of 

 young men who occupy the benches in the laboratory 

 during Professor Haeckel's unique Sunday - morning 

 service. Each student has before him a microscope 

 and a specimen of the particular animal that is the 

 subject of the morning's lesson. Let us say that the 

 subject this morning is the crawfish. Then in addition 

 to the specimens with which the students are provided, 

 and which each will dissect for himself under the pro- 

 fessor's guidance, there are scattered about the room, 

 on the various tables, all manner of specimens of allied 

 creatures, such as crabs, lobsters, and the like. There 

 are dissected specimens also of the crawfish, each prep- 

 aration showing a different set of organs, exhibited in 

 preserving fluids. Then there are charts hung all 

 about the room illustrating on a magnified scale, by 

 diagram and picture, all phases of the anatomy of the 

 subjects under discussion. The entire atmosphere of 

 the place this morning smacks of the crawfish and his 

 allies. 



The session begins with a brief off-hand discussion 

 of the general characteristics and affinities of the group 



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