I9I2] 



George D. Beul and George A.. Geiger 



79 



Most of the original tests were made with new Condoms. Many 

 tests were repeated with Condoms which had previously been em- 

 ployed by us in pigment-diffusion experiments but which, prior to 

 being used again, had been thoroughly washed with portions of the 

 solvent to which they were soon to be subjected in the new diffusion 

 tests. Defects in the rubber could easily be detected. All doubtful 

 results were ignored. Numerous repetitions prevented erroneous 

 deductions. 



In the accompanying summary we present an outline of the 

 various tests and the main results of each. For the sake of con- 

 venience we use in the summary the following abbreviations : 



D, diffusion; Di, pigment appears in the diffusate within lo minutes; 

 D2, pigment does not diffuse within 10 minutes, but appears in the 

 diffusate within 30 minutes; D3, pigment does not diffuse within 30 

 minutes, but appears in the diffusate within i hour; D4, pigment does 

 not diffuse within i hour, but appears in the diffusate before the lapse 

 of 2 hours ; D5, pigment cannot be seen in the diffusate before the third 

 hour of diffusion, but appears before the fourth hour; D6, pigment 

 cannot be seen in the diffusate before the sixth hour of diffusion, but 

 appears before the eighth hour; D7, pigment cannot be seen in the 

 diffusate before the tenth hour of diffusion, but appears before the 

 twelfth hour; D8, pigment appears in diffusate in about 24 hours; 

 O, no visible diffusion at any time within a week. 



IL SUMMARY OF DIFFUSION DATA 



