Septembkr. 1912. 



KXOWLKDGE. 



-4r- 



Figure 385. P.for- 

 inosmn, showing 

 patches of little white 

 discs amongst the 

 fibrils, X 2000. 



Figure 386. The 

 layer underneath, 

 showing the cause of 

 L the patches above. 



Figure 387. Trtccrattmu javus, side vu-u. Obj. ctnc used. Swift & Son's 

 one-sixth inch, dry of 0-S5 N.A., orthochroinatic plate, no screen, magnifi- 

 cation six hundred diameters, exposure b\- lamplight ton uiiiuitcs. 



Figure 3SM. Part of the same valve X 25U' . 

 Swift & Son's oil innnersion one-twelfth inc 



:i.-ed. 



I-'loiKi: -j^M. T. faviis from another valve, ^''. 

 structure. Magnified one thousand five hundred ui, 



