20 



C. SASAKI. 



The manner in which the maggot becomes parasitic ia so far as 

 known, unique, and therefore of peculiar interest to us. The opinion of 

 my father that the maggot hatches outside and becomes parasitic by 

 entering through the stigma of the silkworm, must not be set aside al- 

 together, but demands a fuller investigation. 



IV. 



Diseases and Symptoms either caused by or concomitant with 

 the presence of the maggot in the silk-worm. 



The maggot iufesting the silkworm causes not only the disease 

 already referred to as "Fushidaka" but gives rise to many other dis- 

 eases and symptoms. Of these, the following may be mentioned: — 



1st. " Umiko" (Luisettes ) ( PL IV, fig. l)m which the segments 

 of the silkworm swell up, the fat and visceral organs are dissolved 

 into a milky fluid, and the animal becomes quite inactive. If the silk- 

 worm once presents these symptoms, it dies sooner or later, before 

 spinning a cocoon. On dissecting such diseased worms I have almost 

 always found the parasite lodged in the ganglia. 



2nd. "Tareko" (F/«c/ie?7'ß). The silkworm affected by this dis- 

 ease ( P/. IV, fig. 2, 3) hüH its body much softened and tinged dark 

 brown, and its internal organs all converted into a dark brown fluid. 

 A slight touch on the surface of the body is sufficient to wear off the 

 skin and cause the dark fluid to flow out. This disease occurs in the 

 silkworms nearly at the end of the fourth moult or later at the time 

 when it spins its cocoon, or after it has completed it, and is known to- 

 the silkworm growers to be very injurious for, if the infested silkworms 

 perish within u cocuon, the latter is always injured by their dark brown 



