RECORD: STRUCTURE OF CERTAIN WOODS 261 
pronounced tendency in this direction. It is interesting to note, 
however, that the number of tiers per inch in the latter woods (so 
far as known to the writer) is between 45 and 55, while in the satin- 
wood it is about 80, 
Most of the woods with ‘‘ripple marks’’ belong to the Legu- 
minosae. Following isa list of woods examined by the writer in 
which the storied structure was not observed, though a few 
(marked with an asterisk) have been reported by other writers and 
are included in the list. Some of the more common synonyms are 
placed in parentheses. These woods are: Adenanthera, Albizzia*, 
Bowdichia (?), Browneopsis, Cassia*, Cercidium, Cercidophyllum, 
Cladastris (Copaiba), Copaifera, Cynometra, Daniellia (?), Dimorph- 
andra, Enterolobium, Erythrophloeum, Eysenhardtia, Gleditsia, 
Gymnocladus, Haematoxylon, Inga (see page 259), Intsia, Kingio- 
dendron (?), Lysiloma, Mimosa, Pahudia, Parkia*, Parkinsonia, 
Peltogyne, Peltophorum (?), Piptadenia, Pithecolobium, Prioria, 
Prosopis, Pterodon, Robinia, Sindora (Vouacapoua), Zygia (?). 
In this investigation all of the woods in the extensive collec- 
tions of the Yale School of Forestry were gone over. Since many 
of these are from tropical regions, of which our botanical knowledge 
is far from complete, it is by no means certain that all of the spe- 
cific identifications are correct, though special effort was made to 
eliminate errors or indicate the doubtful cases. A considerable 
number of woods, mostly belonging to the Leguminosae, have 
been omitted because their botanical status has not been deter- 
mined. The following table is published with a view of calling 
attention to an important feature of wood structure and with the 
hope of stimulating further investigation in this direction. The 
writer will ale ra assistance in correcting and extending the 
data. 
NOTEs: Unee. oe not eared are Pee npape woods nar ia wad raga = 
of the rays, th I ““Wood p 
refers to the secondary seriation produced by the individual cells of the wood paren- 
strands; not visible without lens. ‘‘Fiber pits storied” refers to the hori- 
scuial seriation of special pit areas on.the wood fibers. here not noted does not 
ily mean that the feature is absent, since not all of the woods were examined 
microscopically. ~‘‘ Number of tiers per inch” applies exclusively to measurements 
by the writer and is the basis for ‘‘tier-height.'"’ Adash indicatesa tendency. Data 
from other writers are credited to them and are as nearly complete as their descrip- 
tions will permit. 


