194. Table for ascertaining the Heighés of [Aprit, 
448 Vitis or Cissus, fr. Nipal. 
Sp. 4°5 inch. diam.; wood spongy and very coarse-grained; fibre very 
small in proportion to the tubes, which are many and large; rays very dis- 
tinct, of a reddish brown colour, forming a handsome waved figure ; bark 
stringy. 
449 Wrightia gigantea, Wall. fr. Nipal. 
A large climber.—Sp. 2'5 inch. diam. ; 10 layers; wood whitish, with con- 
siderable lustre ; rather soft. 
450 Wrightia antidysenterica. Lathon, B. fr. Tavoy. 
A small tree ; not used. 
451 Wrightia tinctoria. (Indigo tree.) 
The leaves yield indigo. The wood is “ beautifully white, close-grained, 
coming nearer to ivory than any other known to me.’’—Rowd. 
452 Xanthophyllum. Saphew, B.; Choo-muna, T. ; fr. Martaban. 
Very large ; wood used for posts and rafters. 
453 Xanthoxylon alatum. Timbhus, P. and N. fr. Nipal. 
Wood soft and open-grained, like aspen ; bark very tubercular. 
454 Xylocarpus. Keannan, B. fr. Tavoy. 
Timber from 10 to 20 feet Jong ; very durable; used for furniture and in, 
house-building. 
Zeethee. See Ziziphus. 
Zimboon. See Dillenia. 
Zitha. See Castanea. 
455 Ziziphus incurva. MHarobaer, P.; Kadabusi, N.; fr. Nipal. 
Wood in considerable estimation.—Sp. 3°5 inch. diam.; fibre brownish 
white, with little lustre ; rays in the outer layers distinct, but of the same 
colour as the fibre ; bark coarsely fibrous. 
456 Ziziphus. Zeethee, B. fr. Tavoy. 
Wood hard and durable. ‘ 
IlI.—Table for ascertaining the Heights of Mountains from the Boiling 
Point of water. By James Prinsep, Sec., &c. 
A correspondent has suggested to me that many readers of the 
JourNAL are anxious to possess a ready means of measuring heights 
by the temperature of boiling water, as it frequently happens that they 
find themselves in situations where this simple method may be appli- 
cable when it is out of their power to resort to the more generally 
practised operation with a barometer. 
I have accordingly drawn out a table founded on the best procurable 
data of the present time: but it must not be concealed that sufficient 
accuracy has not been attained in experimental researches on steam of low 
temperatures to warrant implicit reliance upon the results; for although, 
since the important application of steam as a motive power, numerous 
experiments have been made to ascertain the elastic tension which it 
exerts at different temperatures both below and above the ordinary 
boiling point ; still, below 212°, the points fixed by experiment are 
at intervals of several degrees asunder, and there is no thorough 
accordance between those of different experimenters. 
