198 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I40 



and 1945 measured 14.5 cm. Sections a, from 3 cm. inward in first 

 1943, show I see plus i psce for two tip flushes for 1943, i see plus i 

 psce for two ( ?) tip flushes for 1944, and i inc for 1945, giving five 

 growth layers for five tip flushes for two-plus years. The outer 

 growth layer of 1943 makes up from one-eighth to one-tenth of the 

 annual increment, thus corresponding to the short outer tip flush. In 

 contrast, the outer growth layer of 1944 makes up about one-half the 

 annual increment, a ratio similar to that of the two tip flushes. Sec- 

 tions b, from near the base of first 1944, show i see plus i psce for 

 two (?) tip flushes for 1944, and i inc for 1945, giving three growth 

 layers for three tip flushes for one-plus years. Sections c, from base 

 part of the second or offset flush of 1944, show i see for one tip flush 

 for second 1944, and i inc for 1945, giving two growth layers for two 

 tip flushes for one-half -plus year. Under the wide-field binocular, 

 sections a, h, and c give 4, 3, and 2 growth layers, respectively. The 

 sharpness of one growth layer differs very little from that of another, 

 whether annual or intra-annual. Vessel size and number vary some- 

 what, but on the whole this difference is only local. 



WPe 1-7, cut off June 17, 1945, contained two (the second offset) 

 tip flushes for 1944 and one incomplete tip flush for 1945, which was 

 a prolongation of the offset flush of 1944. Sections a, from 4 cm. in- 

 ward from the outer end of 1943, show i see for one tip flush for 

 1943; I see for two tip flushes for 1944; and i inc for one tip flush 

 for part of 1945, giving three growth layers for four tip flushes for 

 two-plus years. The wide-field binocular, in comparison, gives three 

 growth layers, the middle one of which has two lenses. Sections h, 

 from 5 cm. out in first 1944, show i see for two tip flushes for 1944; 

 and I inc for one tip flush for part of 1945, giving two growth 

 layers for three tip flushes for one-plus years. The wide-field 

 binocular gives three growth layers, that of 1944 being double 

 and that of 1945 lacking large vessels. Sections c and d, from 2 cm. 

 out in second 1944 (one each from two offset branches), show 

 I see for one tip flush for part of 1944; and i inc for one tip flush for 

 part of 1945, giving two growth layers for two tip flushes for parts of 

 two years. Here the wide-field binocular gives two growth layers with 

 the addition, in c, of a lens of 1944. In sections h, the intra-annual of 

 1944 under the wide-field binocular is revealed under the microscope 

 as a circle of injury, seven-eighths of the way out in the annual incre- 

 ment, and made up of nearly circular local patches of deeply stained 

 tissue surrounded by two to four rows of densewood tracheids either 

 tangential to the section or tangential to the entire patch. Many of the 

 patches contain short cracks. The densewood, the position in the an- 



