miscellaneous: tumors in absence of parasites 479 



Fig. 358. — Chestnut wood of the year 1914 in cross-section, showing tyloses 

 in the pitted vessels. Bark injected by Caroline Rumbold in the Spring of 1914, 

 with 3^00 g.m. Li2C03, cut and stained by her in 1915. Photomicrograph by 

 the writer November, 1916. 8 mm. Zeiss apoc. obj., No. 4, comp. ocular and 

 bellows at ,35 on small upright stand. (See Fig. 55.) 



