120 
Gerry.—The Distribution of the 
The description of the abundance and modification of the bars of 
Sanio in each genus of the living Conifers, taken in the order of classifica¬ 
tion of Engler and Prantl, is as follows. Beginning with the Abietineae, 
we find in Pinus numerous straight bars between pits which are, for the 
most part, in single uncompressed rows. In Picea canadensis the pitting, 
although mainly uniseriate, shows a few opposite pits. The greater part 
of the bars are straight, but instances of curved and, rarely, even of double 
bars appear. In Psetidotsuga taxifolia the general uniseriate pitting, with 
exceptional cases of opposite pitting, is obscured by tertiary thickening. 
Nevertheless the straight or occasionally slightly curved or double bars 
are visible in abundance. Cedrus Libani has a closely packed uniseriate 
and opposite pitting with straight bars. Larix occidentals likewise clearly 
shows numerous bars of Sanio. In Tsuga canadensis (root) abundant 
straight or curved and double bars are present with the, for the most 
part, opposite pitting. In Keteleeria species (root) we find both opposite 
and uniseriate pitting with a notable crowding and increase in the number 
of pits between the bars ; here also the bars are straight, curved, and 
often double between the pits. In a similar way Pseudolarix Kaempferi 
has both uniseriate and opposite pitting with straight, as well as strongly 
curved, bars. Abies balsamea , the last of this group, with its generally 
uniseriate pitting and curved bars, is illustrated in PI. XIII, Fig. i. 
In the Taxodineae also, the bars of Sanio are well developed. Al¬ 
though in the root of Sciadopitys verticillata pits without bars occur, 
yet, for the most part, curved bars, ‘ tilde ’ shaped bars, and even double 
bars are in good evidence. In Cunninghamia sinensis they are not so 
thick, but apparently have split and adhered to the edges of the pits. 
Athrotaxns ctipressoides has single rows of pits and numerous bars. 
Likewise Cryptomeria japonica and Glyptostrobus heterophyllus show a suf¬ 
ficient number of bars to make their presence unquestionable. In Sequoia 
washingtoniana the pits are both uniseriate and opposite, often being 
somewhat oval in shape ; the bars are generally straight. Taxodium 
distichum is characterized by a crowded, flattened, and often irregular 
pitting. The bars are straight, curved, and slanting. There are, moreover, 
some indications between the opposite pits of vertical bars perpendicular 
to the horizontal bars of Sanio. 
Further evidence is derived from the Cupressineae. In Chamaecyparis 
thuyoides the pitting is uniseriate, and the straight, often double, bars are 
very abundant. Callitris arborea and Biota orientalis have uniserial pitting 
and numerous bars. In Thuyopsis dolabrata the uniseriate pits are not 
crowded, and the bars are not so numerous. Libocedriis decurrens has 
uniserial, rarely opposite, pits with both straight and curved bars. Cupressus 
Govemana , with its single-rowed, open pitting, shows scattered bars— 
straight, curved, or double. Fitzroya patagonica , too, has uniseriate pitting 
