55i 



W-E observations had disappeared. As an example I give again a 

 table of results, also plotted in fig. 5 and tig. 6. 



Quartz. , (vestibule 

 axes L Aug. 27] 



^ hours 



" hours 



Fig. 5. 



Fig. 6. 



Quartz cylinders: axes jj. Date: August 27. 



74.97 75.03, hence E > W 0,06. 

 Quartz cylinders: axes j_. Date: August 27. 



53.95 53.90, hence E < W 0.05 



The above mentioned and further observations justify us in con- 

 cluding that, an injiuence of the orientations of a quartz crystal on 

 the ratio of mass to loeight is less than 1 in thirty millions. 



Subsequent observations were made with two calc spar cylinders 

 with the same results as obtained for quartz. 



These observations were also made in the vestibule. 



The results obtained are in agreement with the conclusion in ^ 2. 



8. The torsion rod was next charged with a small glass tube 

 with 3'ellow lead oxide at one end, and one of the quartz cylinders 

 at the other. A difference of the ratio of mass to weight for these 

 substances was certainly less than 1 in twenty millions. 



9. Radioactive substances. Observations were begun with uranium 

 oxide, included in a thin cylindrical glass tube. The results were 

 ratjier puzzling. A first series of observations in the cellar gave, in 

 the above used nomenclature, E>W 1,2 mm. In this series lead 

 oxide was compared with uranium oxide. 



On August 24 I began observations with a second glass tube 

 charged with uranium oxide. I resolved to compare this second tube 



