h. Mr. A. W. Blyth. Observations on the [May 15, 



working places A, B, C, shown in the accompanying plan, and early in 

 the present year that 1 could get into those marked D, E. With the 

 exception of some burnt hay or dried grass which I found at the 

 point X in one of the return air- ways, I saw no traces of burning nor 

 deposits of coked coal-dust in any of the main roadways, but I found 

 well-marked deposits of coked coal-dust in all the working places in 

 both districts of workings as far as I was able to penetrate. The 

 plan shows that the current of fresh air which came down the down- 

 cast shaft was split up into three separate currents at the points K 

 and L. The districts A, B, C, and D, E, were thus ventilated quite 

 independently of each other, and thus it was impossible for any out- 

 burst of fire-damp which might take place in one of them to affect the 

 quality of the air in the other. 



We are thus compelled to fall back upon some other mode of 

 explanation in this case, and I now submit that in the present, and in 

 my previous papers, I have brought forward sufficient evidence to 

 show that the coal-dnst hypothesis is the only tenable one. If it be 

 admitted, however, that this hypothesis is applicable to Dinas 

 explosion, the conclusion is inevitable that, cceteris paribus, it is equally 

 applicable to every case of the same kind that has ever occurred. 



III. " Observations on the Ingesta and Egesta of Mr. Edward 

 Payson Weston during his Walk of 5,000 miles- in 100 days. 

 By A. WYNTER BLYTH, Medical Officer of Health for 

 St. Marylebone. Communicated by B. W. RICHARDSON, 

 M.D., F.R.S. Received April 30, 1884. 



On the 15th day of March, 1884, Mr. Edward P. Weston finished 

 successfully a pedestrian feat, which consisted in walking 50 miles a 

 day, Sundays excepted, until he had traversed 5,000 miles. 



The last 300 miles were walked on a level track in the Victoria 

 Hall ; and frequent observations of the pedestrian's pulse and respira- 

 tion, &c., were made during six days by Mr. Green, M.R.C.S., acting 

 under the instructions of a Committee, the active members of whom 

 were Dr. B. W. Richardson and Dr. Ridge. Mr. Green also made 

 some volumetric determinations of urea for the purposes of his clinical 

 report ; and he measured the urine, preserved the faeces, and weighed 

 or measured all the food, whether liquid or solid. 



Day by day I received the urine for detailed analysis, and at the 

 termination of the walk I also received a jar containing the faeces 

 collected during the five days ending at midnight, Saturday, 15th 

 March. 



