DISEASES OF SILKWORMS 51 



chrysalid and the moth : and may infect the seed. 

 To prevent this disaster, it suffices to hasten up, by 

 warmth, some of the moths, and examine under 

 the microscope a particle of the stomach-pouch. 

 \flacherie be found in them, all the seed from that 

 brood must be destroyed, lest it spread the disease. 

 By 1868, Pasteur had worked out these facts. His 

 coming to Alais, that year, was in triumph : his 

 prophecies were fulfilled, as in 1867, so in 1868 : 

 henceforth, the way was clear to all men, how to 

 protect this great international industry and bring 

 back the good times. Back in Paris, he was 

 occupied over problems of fermentation. On 

 October 19, he suffered a cerebral haemorrhage. 

 It is a memorable story that M. Gernez, one of his 

 assistants at Alais, tells of this illness " One night 

 when I was alone with him, I had been trying in 

 vain to divert him from these thoughts (of his un~ 

 finished work). At last, I gave up hope of suc- 

 ceeding, and let him think-out the ideas which he 

 was wishing to make known. Then, finding, to 

 my astonishment, that they had the clear and 

 precise form which all his work has, I wrote at his 

 dictation, without changing a word, and took next 

 morning to his illustrious colleague Dumas, who 

 did not believe his eyes, the note which appeared 

 in the compte rendu of the Academy, October 26, 

 1868. This was eight days after the seizure which 



