On Monday evening of the Bank Holiday 7 August, the four boys who came under the Swansea Union: Vavassor Morgan (6 years old), Edward Mathias (10 years old), Stanley Howells (8 years old) and Simon Jones (3 years old), left Pontarddulais at 6.30 pm to catch the 8.15 pm mail train from Llanelli to London, en route for Paris. They were accompanied by the Rev. D.Lloyd Morgan and Mrs. Evans, grandmother of Simon Jones. A nurse joined the group in London. At Llanelli, Mr Evans the station master, kindly arranged for a special first class compartment.

On 9 August the Hendy party left on the same journey. The four children were: Priscilla Jane Bowen (4 years old), Emily Benson (4 years old), W.Idris Hopkins (8 years old) and David John Edwards (5 years old).

The Pontarddulais party arrived in Paddington at 5 am on Tuesday morning, at Charing Cross they were provided with a special saloon to take them to Dover, and in a short time they were on a steamer crossing the channel to Calais. Upon landing in France, Rev. D.Lloyd Morgan soon discovered the difficulties of being in a foreign country with no knowledge of the native tongue. However, they managed to get a train from Calais to Paris, alighting at the Nord Station at 5 pm where they were met by a porter with transport to the Grand Hotel. This hotel was connected with the Pasteur Institute as no other hotel would accept anyone suspected of being infected with Rabies.

Next morning the children were taken to the Institute nearby, an impressive building in extensive grounds with pleasant walks among well kept trees and shrubs. Here all treatment was offered for free. The standing rule was that each day new patients were treated first. The operation was performed in the following manner. The doctor would sit in a chair and the little patient placed on his lap with the legs firmly gripped by the doctor's knees, and the arms pinioned in a vicelike grasp of an assistant. The stomach was exposed and a white mixture brushed over it. Then the doctor takes hold of a fold of abdominal flesh on one side of the stomach and a serum is injected into it. The process is repeated on the other side.

Naturally the children did not take too kindly to the inoculations, but on the first day they marched through the gates unsuspectingly. Poor Stanley Howells was the first in the treatment room, and the other children, on hearing his shrieks, were convinced that he was being killed. The next morning considerable difficulty was experienced in persuading the little ones to visit the Institute. Simon Jones was frantic with fear, lying in the road outside the hotel, kicking anyone that tried to pick him up. Treatment lasted for 14 days, by which time the children could fairly stand the inoculations without flinching.

The incident at Pontarddulais, and the visit of the little children to Paris created a stir of excitement and concern in the national press. The London weekly of Saturday 26 August gave a very interesting account of their visit and the Modus Operandi of the treatment.