PLASSOMYXINEAE 



115 



latest communications on Molluscum Contagiosum that 

 have come to my notice is a paper by Udo. J. Wile and 

 Lile B. Kingery. The authors' task was to test the question 

 of filtrability of the virus. They quote Marx and Sticker 

 on molluscum contagiosum of birds : " sterile " filtrate 



7. 



FIG. 31. VARIOUS CHANGES IN MOLLUSCUM BODIES AFTER BEING KEPT 

 IN WATER AT ROOM TEMPERATURE FROM Six TO FORTY-SIX DAYS. 

 1, Unchanged save cortical layer clearer ; 2. motion in clear central 

 part ; 3, two with motion throughout, except in some skeletal parts 

 and in the cortex, which shows an opening in both. The granule in 

 the upper body was of a deep crimson colour ; 4, motion throughout 

 except in the skeletal part the granule above x, Y, was first seen 

 at " x," it moved to " Y," and then to where shown ; 5, encapsuled 

 body, motion in middle part and in the part which bulges into the 

 intracystic space ; 6, body in which a trophonucleus had appeared 

 after slight motion in adjoining granules ; 7, body with trophonucleus 

 and several clear spaces but without motion. X 500 diams. 



rubbed into scarified areas on the comb of fowls having 

 produced lesions in eight to ten days. Marx and Sticker 

 found that the virus was extremely resistant to heat, light, 

 and cold, and that its infectivity was maintained when the 

 material had been kept for a considerable time in glycerine. 



